One thing I never picked up on when I started to hand quilt was using a single thread. I had a double thread, pulled like heck to bury the knot (and yes, I did pull threads in the fabric doing it!) It wasn't till I showed one of my wallhangings to a new friend and she asked me why I used a double thread. I didn't pick up that in the how to pictures!
Don't be afraid to ask ANY questions - one of us probably found out the hard way!