I know of someone in my live support group who has never had a fill and I think he was banded about a year ago. If you can get your mind set to where you can have control and are losing weight, then there's no harm to not having a fill.
I was banded on Nov 2, 2010 and have lost about 90 lbs so far. I know that sounds like a lot for such a short period of time, but when you are larger the weight comes off faster in the begining. My initial weight was 359 lbs.
I too was worried about having a fill, yet I could see the pros and cons. After all, I didn't go to all this trouble to have the surgery without utilizing the tool. So, I discussed my concerns with my doctor and he said we could go with a very small fill and see how I feel. That was just enough to give me that extra restriction I needed as I felt I was starting to get a little too hungry inbetween meals. A couple months later when I went to the doctor I still had a concern about getting another fill but I was also concerned that I was starting to eat larger quantities. Some people say that when you lose the weight the band will get looser. So once again we went with a small fill. While I'm happy that I did it, I do have to be more careful about eating certain foods but that is my reminder... so it works out in the end.
I guess what I'm trying to say is that if you can do it on your own, there is nothing wrong with that but do keep in mind that your band is a tool so don't be afraid to use it to it's potential if needed. Best of luck to you!