First of all,

, Adaem and congratulations for the progress you've made so far!
You're right. This whole thing can be quite daunting, especially when there seem to be so very many details to attend to. Calories. Carbs. Fiber. Whole grains. Exercise. Those dad-blasted veggies. It's enough to make your head spin! Hmmm I wonder how many calories are expended while head-spinning...
I'm rather new to the whole calorie-counting thing (even though I've been on some sort of diet pretty much since I left the cradle), but I can tell you what I've tried to do to ease the weekday vs weekend issue.
Basically, I've tried to be "good" Monday through Friday. "Good" means having a good deficit (Calories Burned is greater than Calories Consumed). Exercise Monday through Friday, strength and cardio. Try for 10k steps. 72 oz water daily. On weekend days, I slack off. No all-out food-fest, but my deficit can be less and I don't worry about doing the exercise.
If, for some reason, I mess up on a weekday, Saturday is my mandatory "make-up" day.
This plan is one I think I can really stick with. I can make the push Monday through Friday because I know the weekend is coming, when I can cut myself some slack.
It may not be a plan for everyone, and some may think it's far too lenient, but that's my story (whoops, I mean plan) and I'm sticking with it!
Again, congrats on your progress so far and good luck with moving on to the next phase!