That's an awesome start. I totally agree with trying one or two things at a time and gradually building up with additional little changes. Two things, have you got some protein in every meal? Maybe something to aim for cause it will keep you fuller for longer. Plus, I find that when I just eat an apple, by itself for a snack, it actually ends up making me hungrier. There's something about apples on their own. I can eat one after a meal without a problem. Hopefully you're different but if you find them making you hungrier, you might need to change that snack.

I love coke zero too!

Good luck hun!