For me, it's easier to keep going once I'm going than it is to get started. Taste buds DO adapt, and new habits become just as comfortable as older ones. I'm not suggesting it will be easy as pie, but it seems SO much easier once you're in the midst of it.
Saying no to foods for me is a commitment. Like RockinRobin, moderation doesn't work for me. I guess I'm an all or nothing gal (at least in this case). I can look at the foods that most tempt me (cake, sweets) and say no because I am sticking by a decision I made long ago. There's no debate, there's no "I want it", there's no "just one...". My mindset doesn't allow for that because of a decision I made when I started out. I'm constantly conscious of what I want to achieve and the steps I can take to reach my goals. That's been my approach and it's working. The best thing is to figure out what's going to work for you and then stick by that

.
I also find exercise keeps me on track. It acts as a very effective reminder. There is NO WAY I'm going to stuff my face with unhealthy food after pushing myself to exertion at the gym and spending time each day very well aware of the blessing of having a healthy body, the feeling of strong muscles, seeing other people at the gym who are pushing themselves and are focused on healthy living, etc. I think exercise and the gym are what saves me.