Jessimina - another tip is to get lots of practice with straight lines. Just quilt a grid or along your sashing.
Don't try to quilt through any appilque pieces, they're way too thick. I once saw a beautiful applique quilt that had been professionally hand quilted with white thread all over and she had outlined all the appliques on top and I thought it was ruined! You should quilt around appliques which helps to make them puff up.
If you quilt upto a really thick intersection, you can "travel" through and skip a few stitches.
You're right to start with something small that you can turn around in your lap. Don't expect to be able to quilt in every direction at first. That takes time.
You might also want to experiment with where you sit. The arms of a chair are sometimes too high making your shoulders scrunch up uncomfortably. It helps to sit at a table or to have something like a pillow on your lap to support the hoop. I usually prop my feet up on an ottoman and that brings the hoop close enough without my needing to lean forward.
Just keep practicing. You'll get more comfortable with time and grow to love it like we do!