Your signature says it all - one step at a time. I think getting involved in one of the support threads or forums here really helps, too. I've found this place to be a great source of support and I hope it is for you as well. It sounds like you're getting some pretty good habits in place already, with eating small meals and snacks, and getting in some walks. Do you track your calories? You can use places like
http:///www.fitday.com/ or
http://www.nutrawatch.com/ to keep track of exactly what you're eating every day, which is very helpful for a lot of people.