A good level and a 4-1/2″ diamond blade on a portable grinder, will get you far for do it yourself tile repairs. If the DIY job is any bigger you are going to need a DIY tile saw, this being a lot like a table saw only it cuts wet and uses a diamond blade. Trowels and a few other hand tools will assist as well. Use a dry line and also a chaulk line to get the layout started straight and accurate. Spacers help with the grout grooves although you can keep the tiles butted together in some cases to eliminate heavy grout lines. Do a few tests to see what the boss likes best and score some points! Design DIY can give you ideas and you can create your own home improvement masterpiece in no time at all.Home Depot Rents most of these specialty tile tools to save you in the long run, rent it today and return it tomorrow!

MK Diamond MK-170 Portable 7-inch Wet Cutting Tile Saw