I posted this a couple weeks ago. Folks recommended several you tube videos, but basically said to just load some scrap fabric and practice.
http://www.quiltingboard.com/main-f1...s-t282764.html
Also, what specific issues are you having? Many on this board have the same machine and may be able to help. This is how I set my tension:
https://www.youtube.com/watch?v=Q1mRhcquZTM
My dealer also said that for some finer weight threads you may need to go around the tension dial twice.
I would send a note to HandiQuilter headquarters and tell them about your experience with the dealer. They may be able to route you to a different dealer or rep in your area.
Finally, I would contact some other long arm quilters in your area and ask if they would be willing to give you some lessons. Probably won't be available until after the holidays!