I recently bought a 1/4" pressure foot. Love love love it! I have a Singer Pro and a Brothers 1/4" pressure foot fit my machine and was $16.00 at local Shappley's store.
I did try the methods of mole skin, post it note strips, etc to mark a 1/4" line. My seam(s) still varied just enough to cause the piecing to be 'off'.
Accurate cutting and accurate seam allowance will make your experience much more enjoyable. Good luck with your first quilt. Beware: quilting is addictive
Something else I learned: the ending portion of my seams were vearing to the right....I learned to keep my free hand on the material until all of it passed under the needle. Amazing what a difference this made in the seams.