I used to have a big ass and a lot of fat in my belly, but now i'm satified with my figure. ^^
the tips are,
1. write your own loss weight plan
2. buy a balance and weigh yourself before and after dinner
3. eat less for supper
4. buy expensive cosplay costumes which are tight for you (it's the biggest motivation for me to loss weight)
Please just be sure yourself that you will have your ideal figure before you want to quit
just step by step.