You will love the 6600. The yahoo group helped me get started. 1st thing I did was to copy the manual (there was one online, also) I put this copy in a 3 ring binder. I went over every page and wrote notes on it. I also stitched every stitch on a fabric book and noted the stitch on the fabric. I now keep a spiral notebook nearby also and have pages with titles to separate my notes. Seems the needle can be moved left or right and does get adjusted alot depending on the foot used. The machine has a default setting for the needle, but I soon learned I enjoyed other settings.
My 1st issue was with the thread. There is a distinct feel to the thread when it is properly thread in the upper hook (don't know the real name). Lint has to be cleaned out often. Dealer told me 6600 will use any thread. I do fine certain threads do free motion quilting better than others on this machine.
The yahoo group is wonderful. Try it. Enjoy your new 6600.