Energy and mental focus when fasting?

I have some previous experience with IF, mostly doing the 16:8 model for a few weeks and at one point going for 36 hours without any calories. I didn’t really feel during these times that I got very tired or fatigued and hunger was definitely manageable once I had set my mind to it.

Now though I’m back to studying, working remotely on the side and exercising more or less daily, not to build muscle as much as to lose weight and improve my posture, loosen up the body and all that. I’ve recently stopped drinking for an unspecified amount of time, after honestly pretty much years of drinking almost daily. I feel like having some sort of a fasting routine would help me clean out my system, speed up the weight loss, help me in learning some much needed self-discipline and get rid of the kind of nervous snacking that now comes with taking up studies and laying off the drink.

Problem is, I have a ton to do and to be successful with all or any of it I can’t sacrifice energy or mental focus. Basically it’s a risk I can’t really take. I’ve been thinking that going with the 10:14 model and a slight calorie deficit for a few weeks to get started would be relatively safe, and that I could tighten it from there, working towards having one full day of fasting a week and doing 8:16.

So here comes the question. How do you feel like IF affects your energy and focus levels, long and short term, and what can I do to keep these up? I see it as a path towards my goal but can’t have it overshadow the rest of the stuff I’m doing.