This is what helps me, in addition to the excellent tips I've read on this post (haven't read them all tho) - match your seams up and pin your fabric, except align the pins to where you will be sewing, so the pin acts as the seam. Now unfold your fabric and see how your seams match. It's a lot easier to unpin and repin than to unsew and resew! Good luck, welcome to the quilting world, and enjoy your journey!