I would suggest that you don't cut all your fabric into squares. Once you decide on a quilt you are making, you might be able to sew strips together and then cut them apart so you would have a pair (or more if sewing more strips together). It could make your sewing much faster and more accurate. Also, there is a program called Triangulations (~$30) which is sold on a CD. If making HST, you print out the size you need (from the disk) and paper piece the HST, which come out perfect every time. Good luck!