Cut accurately.
Figure out where that pesky 1/4" seam is on YOUR machine and double check when you start a project as fabric and thread can make a difference.
Learn to press carefully. Watch out for those little tucks that sometimes get pressed in.
If you want to make a quilt quickly, choose an easy pattern, don't rush thru a more involved one and cut corners on your quality. It is quicker to be accurate than to rip!