We have a house built in 1950 and it has 18" x 18" glass tile on the bathroom walls. We removed some of the tiles to repair the walls from where the grout was leaking and to replace the tub with a modern one. Because the new tub is a difference height and the plumbing is now in a different spot, I need to cut the existing tiles so that they can go back onto the wall and be reused. What is the best way to cut the tiles? I'm considering taking them to a glass cutting shop. Thanks.