I have a Horizen and was intimidated with it as well - took me about 3 weeks before I actually used it. Had some problems at first as well.
Here are a few things I have learned:
1. bobbins work best if they are only about 2/3 full
2. need to use Janome bobbins ONLY
3. I do this everytime I change fabric: take out my practice sndwich - change the tension on the top to 3 - sew a few stitches - change it to AUTO and then sew a few stitches - and then - magic !! no eyelashes.
4. At the advise of the dealer I take the foot plate off and clean after EACH project and also replace the needle after each prject.
Now I rarely have a problem
Hope that helps. . . My dealer has lessons for life !!