Just a useful tip
Use a diamond tilecutter or a diamond wheel in a angle grinder. The diamond wheel must have a non serrated & preferably wet.
You can a really good edge.
You can get a diamond board from JJ Tanner but an electric motor makes life much easier.
Also another tip. If you cut yourself shaving(girls)you can stop the bleeding with the fluid from a underarm deoderant. I use it in minor surgery to stop venous ooze bleeding.It is Aluminium Hexachlorate.