I make 3-4 of the blocks, then measure them. If they are good, I figure I got it and just keep going. I really don't check all my units after those first ones especially the Bonnie Hunter mysteries as there are so many of them. I will work on my 1/4 seam with each new sewing machine I get and then I will not measure so often. I do have an accuquilt and that really helps with my accuracy and when I do cut, I make sure the fabric is underneath the entire cutting line, I use a sharp cutter and any fabric I am suspect of I may wash and press first as I have discovered using an iron will cause some fabrics to shrink. (I do press all my fabric before cutting). It is bad for accuracy if one fabric in the block gets smaller when pressed. I like to use a walking foot when working with biased edges or long seams. I have figured out where that quarter inch is on my walking foot too. Do I have all perfect points and intersections? Nope, but I am improving on the percentage that are pretty close. I do not make show quilts and never will. My love is in making quilts use and cuddle with.