Today I started to trim the windshield. After fitting the pre-trimmed blank I trimmed 1/4 inch from each side of the forward edge and tapered it to nothing at the rear. Next trimmed 1/8" from each side for the full width. The trimming was done on my bandsaw using the same blade that I use for cutting aluminum. After each cut I block sanded the edge using 80 grit sandpaper.