My doctor has been at me to lose weight and I've heard this is a good thing to do just for general health benefits as well. From my schedule I seem to have a 12 hour period of not eating between dinner and the next mornings coffee (when i dont have a beer in bed), but I was thinking I might try to stretch that out to 16 hours and see how I go.
I do it as 16/8 (what you're planning on doing) and here is some advice I can give you,
1. Choose your time wisely, make sure you choose a time where you know you can go 16 hours without eating. Sleeping still counts as fasting, so if you can get a good 8 hours of sleep, you're halfway there. My chosen times are 6PM-10AM fast, and 10AM-6PM eating.
2. You still need to lay off the sugars. The fasting works wonders, trust me, but not if you're ingesting sugars. Stay away from anything containing high-fructose corn syrup (which is A LOT of foods).
3. Be careful not to break fast. Some vitamins will break fast, all foods, even the smallest snack, will break fast. Anything that starts your insulin will break fast. You can still have coffee but it has to be straight black coffee, no sweeteners (caffeine does not break fast).
4. Flavored Sparkling Water does NOT break fast as long as the ingredients do NOT include any kind of sweetener. If you drank a lot of pop (soda) then this is a good alternative to kicking that habit. However it takes a while to get use to tasting carbonation
5. It's ok to eat carbohydrates during your eating period. Sugar is the only thing you're trying to avoid, this includes fructose in fruits, so have as few fruits as you can. Everything else is fair game.
6. After about a month and a half, it's ok to have some sweets again. Don't go nuts or anything, but it's fine to have a cake or pie here and there.
7. If you're going to exercise, do it during the fast or about 3 hours after your fast has started. Exercise speeds up your metabolism and helps remove fat, but is best done during the fasting period when your insulin is at it's lowest. This way every exercise you do only burns fat.
8. It takes so much time to get use to. It will start off difficult, with your stomach in pain during the fasting periods, but you'll eventually get better at ignoring it. You will also have hunger pains though, that doesn't go away.
9. This one is optional but can hasten weight loss harmlessly. Take L-Carnitine (pill or powder) before working out (or after, up to you). It does NOT break fast and helps keep your metabolism up. There are others you can take but L-Carnitine is the most harmless from what I found. Again, this is optional.