If you look up Mary Titus on the internet she comments a lot about how she does IF. I've found her comments really helpful and descriptive.
The way I do it isn't too terribly rigorous. I take one day a week where I have an evening activity and on that day I eat my breakfast like usual but nothing else until the following day's breakfast. I might have a cup of coffee with cream later in the morning, but that's all (I have no heat in my office and it gets really cold and coffee without cream is just not right.) The breakfast I eat the following day is a normal breakfast and I resume my eating like normal.
I have also done it where I push my breakfast forward as many hours as possible to extend the time between dinner the night before and breakfast the following day. That is harder for me because I have to bring my meal to work and reheat it in the microwave and I find this annoying. But it's good for those times when I'm just not hungry before work. I'm a breakfast person, I love breakfast and find it way easier to skip dinner. But others are opposite of that.
Some people eat only once a day every day but give themselves 4 hours to do it and during that time they eat as much as they want. Others try to make sure that they have a 14 to 18 hour window of no eating every day. Taking a break from eating lets your body do other things.
I have found that once I adapted to this way of eating, that it became really hard to eat a huge meal. So if I eat only one meal during the day, it's not going to give me very many calories for the day because I get full before I get very many calories in. So I only do it once or maybe twice a week.
Female, 5'3", 48, Starting weight: 163lbs. Current weight: 135.
Starting squat: 45lbs. Current squat: 145 x 4.