The link is to the first of a many-part blog post series on IF. VERY good information.
I think it's a great thing to do but don't feel like I need a schedule or like I need to be strict about it or anything... just now and then, I skip some meals. My easiest form of IF is just to not eat till lunch... usually 2 or 3 pm. Sometimes if I'm not particularly hungry I'll extend it a few hours by waiting till dinnertime. No big deal.
My dad once told me that if you don't let your car's gas tank get close to empty now and then, you end up with old gas in the tank that never gets used... like if you fill up when it reaches a half-tank every time. And I don't know if that's bad for the car or whatever, but I periodically let my tank get almost totally empty before I fill it up...
Same thing with IF. IF is letting your gas tank (easily available fuel - from whatever meal you recently ate, muscle glycogen stores, etc) get really EMPTY. Then you can refill with fresh fuel. It just feels really clean and refreshing.