Honestly this is the easiest diet I have ever been on (LC/Keto since April). I have no idea how many calories a day I am eating. Calories in Calories out does not work otherwise you would not be here.
Ignore the calories, moderate protein which means do not eat a 3rd or 4th piece of chicken because you think protein is good for you and healthier than fat, it is not. As for fat, do not go crazy on the fat bombs or macadamia nuts but otherwise eat fat with your meal until you are mostly satisfied
I personally find IF does not matter, whether I eat two meals or 1 meal I do not see a difference. Longer fasts do seem to work and I weigh myself 36 hours after I end the fast and that weight, usually 2-6 lbs lost seems to stay