Not being able to sew that required 1/4" caused me so many tears and lots of rip it rip it time. I was feeling like I could do nothing right. I finally bought a 1/4" pressure foot and found the sewing experience amazingly better. Even my 10 year old grandson can sew that perfect 1/4" seam!
Not only are the seams uniform now. It has made matching seams and points much easier. I still check seam measurements to make sure all is well. The scant 1/4" is just okay....have not learned a precision way to judge that seam.