There is no need to quit. You obviously are just learning. As far as cutting the pieces the same size, do you use a cutting wheel or do you cut with scissors? I prefer scissors as I, too, even being a seasoned quilter had a problem when using the cutting wheel getting them the same size. I reverted to Mom's method. If you are making squares, cut strips the width you want the squares, then mark off each strip to make the squares. When sewing, make sure every seam will match before sewing. even if you have to remove stitching, recut to fit and then sew again. In the long run, it is worth the time you spend making sure it is correct rather than wearing your nerves to a frazzle.