I did my grip at home with some left over elkskin. All in all it took about an hour including sewing.
1) I started by wrapping the grip in plastic food film/saran wrap. Then I taped over the grip with masking tape.
2) Cut the tape up the middle carefully to make a straight line. then trim to have edges fit where you need them. This will make your rough fit pattern.
3) Cut a patch of garment grade leather slightly larger than the pattern in all directions and with about an inch of overlap at what will become the seam.
4) barge cement bow grip and back of leather
5) pull leather TIGHT around bow grip and clamp with copious amounts of binder clips at the front seam area. Keep pressure around all the areas that need to lay tight and wait for cement to dry.
6) trim away excess to match contours of shelf, base of grip, etc
7) Trim away the seam area to fit flush
8) pull back leather ever so slightly from seam area to allow for stitching
9) stitch it shut for a seamless finished look
10) clean up runoff cement carefully with exacto knife and tweezers.