I have 2 all the time must do rules when it comes to quilting no matter what hurry or mind thought I am in and I try to impress the importance of these to all new quilters I teach. I just hope they do these. The first one Pressing, pressing and pressing!! Every seam every piece of fabric before, during and after. I can't stress it enough. Number 2 is to square up each piece, when finished, and before going to the next piece.squaring up each piece with give you a nice finished block that is accurate, especially with HST's. These two things insure a perfect block.