even if you used invisible thread your quilting would show- that is part of the quilting---the only thing to be concerned about is consistancy===as in the stitches should be as even- same size=as possible.
and it's supposed to be an enjoyable hobby--- no point in (sweating the small stuff) even if your stitches don't start out all that even- that's no reason to be undoing- you can only strive to do better as you get more experience.