I have been told that it helps to put the heavier speciality threads in the bobbin.
The 830 is an incredible machine, but (imho) probably too much machine for someone who is non-technical, yes, there is an incredible learning curve to this machine. Maybe you can trade down to a different model, I have the 635, amd very technical, and after 6 months feel I am getting a good feel for it, and hope to be able to move up to the 830 one of these days, but don't know that I can justify the cost for personal use!