Originally Posted by cashs_mom

I use a seam guide a lot and it really helps me with accurate 1/4" seam allowances. As does the method of cutting and sewing 3 blocks and measuring vs measuring the actual seam allowance to make sure your seam allowance is accurate. I've also found that using a 50 or 60 wt thread helps my accuracy. Things don't get wonky because of the amount of space the thread takes up. For some blocks, I also press my seams open and that seems to help.

And I don't know what I'd do if I hadn't learned about starching. I starch all my fabrics before cutting and sometimes during the construction process. It helps to tame the bias.