I too started at 300+, it's a hard thing to say isnt it?? I started at 313 (5'9), now I am 274. 39 down, 114 to go. I want to weigh 160 and I have to say coming here is the best thing you can do. It really does help. For weight loss, I just count calories. If you keep your calories around 1800 you will still lose due to your starting weight. dont start too low like 1200, you will feel like you are starving and want to quit!! Also if you could stick to that low of calories your body will eventually get used to that little of food and slow your metabolism and who wants to do that??
best wishes to you and check in often!