My tip of the day show how I handle 1/4" seams. While I know that there are oh so many ways out there -- this works for me. If finding that perfect 1/4" seam is a challenge for you as well, give this a try. It is shown here on Barbara - my lovely featherweight - but works the same on most machines.
I use a combination of a seam guide from Bonnie Hunter and the seam guide that came with the machine. Using the green guide, lower your needle into the 1/4" hole and lower the presser foot to keep it in place. Then slide the other guide right up next to it and tighten into place. Remove the green guide. Voila --- this will give you a scant 1/4", thus enabling you to have an accurate size square after pressing. (I should have cleaned the machine before this picture -- ah well, live and learn.