Toilets, Sinks, Showers, Tubs and Disposals - cutting a tub surround

:coffee: hello i am brand new to your site here and i could use a few tips here . having a glass block window installed and i need to know the best way to cut the tub surround for the window opening . i am not very good at cutting with a razor knife , can it be cut with a jig saw (new remodeling job , new toy ) also i am putting in 1/2 green board shimmed out with 1/2 green board strips just to reach the tub ridge , old wall was 1/2 drywall and 1/2 plaster . read a post here saying to drywall to the top of that ridge , but did'nt uderstand what is best to fill that void up with ?? :wall:

I would use a small 32 tooth or larger saw blade to cut the product; make sure that blade is turning fast. There might be buildup or slag after cutting, give it a second while it turns cold and it will break right off.