The marcrist blade had no problems with glass i have cut in the past and neither did the standard plasplugs wheel either. Marcrist was just a little quicker in cutting.
Your standard dimond blade will cut glass no probs , the problem you will have is the angle of the blade when cutting will allways cut more in to the back ok of the tile than the front removintg the backing on the tile. When tiling up to the extractor try and tile in behind rather than up to it, also you will be ble to dry cut no bither with an excellent finish.
Marcrist blades will cut glass tiles ok..........but if they have a coloured backing.........dry them as soon as you have done your cut.......the backing on SOME can bubble up a bit:yes:
I've never had any problems cutting glass, and as Charlie says, just be aware of how a circular blade will affect the tile backing.
As far as protective clothing etc...Remember your safety specs as you don't want a glass chip in your eye! I always dunk my hands in a bucket of water after cutting to get any glass splinters off them - don't rub them as you'll only cut your hands up really bad.
I'll probably get shouted at for saying this but I found that rounding a continous rim blade (so it looks like it's been well worn) helps get a cleaner cut. I used an old chisel to do this.
Also, as mentioned already - LOADS of water. Fill the bath right up so you get a soaking off the blade. And cut REALLY slowly.