I don't have that machine but it took me only one practice piece for my used HQ16. I can do a curve with no problem and I do not have a SR. Is there a Yahoo group for your machine? You may find someone quite local who could come over and help. I have a friend with one in Florida and she really likes it. She does lots of customer quilts. The Skype idea is a good one.
I stick with the same combo for my prewound bobbins and top thread. I use Superior prewounds and Connecting Threads Essential Pro. I never have to adjust the top thread but do tweak the bobbin every time I change to a new one. I quilt just for myself and a few friends so I do not need a huge amount of different thread.