I was scared when I entered maintenance also. I basically ate very much like I did in Phase 3.
I eat a Phase 3 breakfast. I eat protein and vegetables for lunch and dinner.
I was very worried about adding carbs so I might only have a half cup of beans or a small sweet potato with dinner.
I eat nuts for a snack.
The mixing of fats and carbs I usually only do at breakfast.
I do have a glass of wine some nights..It has not seemed to hurt.
Unlike most people here, I do not do fun days. I used to be a binge eater and cannot return to those trigger foods that set me off. For me it is high sugar and refined carbs that were the problem. Once in awhile I might indulge in a fun meal..higher fat but generally low carb.
My advice is to add things slowly. Experiment with what works for you. You can always do Phase 1 if your pounds go up.
I also exercise 6/7 times a week. I exercised the entire time on IP.
I also found that Refuse to Regain had some excellent advice on maintenance.If you look at some back posts you can see some of her ideas.
It is scary at first but eventually you will come to enjoy maintenance. I no longer use the packets.
Two other tools I use. I weigh daily and use www.weightgrapher.com
to keep an average weight progress. The other thing that helped me was using the National Weight Control's idea of setting a range of 3 percent up or down from your goal weight. Then you are not so focused on just one number. However, some people find weighing everyday is not beneficial to them.
There are lots of friendly people on the maintainer thread but very often people are too busy to post.