OK, based on your last post I'm going to contradict myself ...
For us compulsive types, I also think there is such a thing as too much planning, because if we do one thing not according to plan, we can feel the whole thing is blown and pointless.
So, when I say plan, plan, plan ... this is what worked for me when I started my program, and I did things this way for a good year before I felt really grounded:
With food, I religiously went to the grocery store at the same time, the same day each week. I made sure I had the kitchen stocked with the healthy foods I needed for the next 7 days. This kept me on track because I always had what I needed on hand and there was no, "Oh I don't have any green vegetables I'll just skip it" or have potatoes or whatever instead.
I had a general plan for the week, but that was basically because I eat on a template every day. The specific items are interchangeable, but I know that breakfast is going to be milk and a starch serving or two; lunch will be two starches, two meats, a vegetable, a fat, and a fruit; afternoon snack will be yogurt and fruit; etc. I don't do a detailed menu for the whole week, but I do plan out each day the day before.
Each night I made sure I had a concrete mental plan for the next day's food, if not a written plan. I'm not a morning person, so I reduced my chances for "Oh I don't have time this morning I'll just wing it today" by laying out what I needed for breakfast and pre-packing my lunch and all my snacks for work. I also knew what I would be having for dinner that next night so when I got home from work, hungry and in a hurry, there would be no room for "what do I feel like?"
I also made some contingency plans, thinking about the potential what-ifs. What if that meeting runs long and I don't get to eat lunch on time? Etc. What if I go to that party and they don't have anything I can safely eat without triggering a binge? What if I go out to lunch as planned but the restaurant doesn't have anything that's obviously on my plan?
With exercise I had to take a different approach. I was so out of shape and had no stamina. Rather than plan out an "optimal" cardio-and-weights routine (yes, in Word and/or Excel) I had to start very small. I knew that if I set up a comprehensive program and didn't follow through one day, or found it too challenging, I'd just chuck the whole thing, feel like a failure, etc. So, my first exercise goal was LITERALLY to do 5 minutes on my exercise bike for the week. I know that sounds silly, but saying I'd do 5 minutes every day, or 3 days, was too much pressure. I had to set goals that I felt were so easily doable that I could feel that reaching them was no sweat, pun not intended. That 5 minutes was torture, but it got me started.
So, be wary of the compulsion to plan things to the nth degree if failing to meet the plan leads to feelings of inadequacy or failure. One of the concepts discussed in the OA book
The Thin Books is the tendency towards "all or nothing" thinking, where small accomplishments are dismissed because they fall short of grand goals. When you're trapped by all-or-nothing thinking, that sense of perfectionism can be really disheartening. You think you're doing the right thing by setting your sights high and looking for the best possible plan, but you could just be setting yourself up to always feel like a failure.
I would say to NOT start BFL if all you feel is an impending sense of doom. Start smaller. Take a 5-minute walk break twice a day. Park in the furthest spot from the door of the store, take the stairs, etc.-- all those silly things you hear about over and over to just get some more "natural" activity into your day. You can do that, can't you? Sure you can! That's no big deal, that's a low-pressure committment. Pick one thing that would make you take a few more steps than you normally do, and commit to that for a week. Then next week, add one more thing. The idea here is not to necessarily pump up your calorie burn in a big way, but to get you started doing SOMETHING and pump up your confidence and optimism. Get a calendar and sticky stars like they use in preschool and give yourself a star every day you accomplish whatever goal you set. Maybe a gold star for activity goals and a green star for food goals, or whatever. Don't worry so much about the days that don't get stars, but pat yourself on the back for the days you DO get stars.
Trust me, I am by nature a cynical, the-glass-is-half-empty kind of person. I lived in the "it's really no use" world for many years. Successes in weight loss were always short-lived, I constantly compared myself with people who naturally or through hard work were thin and healthy, and cursed my rotten fate. I finally realized that when I started dealing with the cards I had, rather than bemoaning the cards I didn't have, I could make progress. I agree with the others -- you are not your husband or anyone else, and feeling down on yourself because this is harder for you than it is for them is pointless. It doesn't teach you anything and it doesn't help. Just concentrate on what YOU have to do. Operating on the principle that you SHOULD be like them doesn't do a thing to help you do what you need to do to make this work for you. You can only work with what you have -- wishing you were different only brings you down more. Banish those thoughts that bring you down; only allow those thoughts that lift you up. That means stop comparing yourself to others; set reasonable goals; pat yourself on the back when you meet a challenge or a goal; learn from mistakes and unmet goals and move on.