Hi Angie and BlondieGirl!
Welcome! I have been doing LC off and on for a couple of years, if you don't count the years in the 70's

I finally figured out some things that work for me, and yes, I am losing well and have energy.
I'd find a plan that seems reasonable, start it, journal or record what works and what might be a problem, and keep making those changes that work. It is a process, because we are all so very different. I do best with a LOT of protien, and tracking things like the cream, cheeses, and nuts and keeping them to spice up things, but not be a major contributor of my daily calories. So, I've joined WW to just track this sort of thing. I found that using LOTS of low carb veges, SOME very low carb fruits and throwing out ideas that stall me, I am doing much better this time around.
About fatique. I was VERY tired the first few weeks, but I also was losing a great deal of weight. Then, I had another fatigue cycle as my blood pressure dropped to normal. Both of these were good things, but not fun. I am not doing anything extreme with exercise, as I think that can, over time, deplete your resources. Instead, I am very slowly building up a tolerance for activity. This was hard, as I used to be very active, but it is one thing I used to do wrong for me.
Now, I lose from .2 to 4 lbs a week, and I do feel very good. I'm going to be below 200 for the first time in at least 10 years. That is amazing!!
Hope you both find the path that works well for you, but just jump in and go. Su