*Replace needed plumbing parts
*Use hardi backer or green boards for walls, make sure all joints and screws are covered with red guard or smiilar water proofing material, adding plastic sheet between the backerboard and the studs will give extra moisture protection.
*Design your shower in advance like shower head loaction to be in the center of the tile for example or use some mosaic border between the tiles to start and finish from tub to ceiling with complete uncut tiles (looks more perfect), adding a shampoo recessed box would be nice!
*if it happend and replaced the tub make sure the drainage and overflow connection are good and test them before closing walls, also make sure they use enough thinset as a bed underneath the tub and a waterproofing plastic sheet under that thinset ifit happend to be on plywood (if raised foundation).
*always end the tiles out side of the tub end line, i mean of the sides ends dont stop the tile where the tub ends but let them go out couple of inches, looks better that way.
*If 2x4 or 3x6 (regular subway tile) used, try to get the matching bullnose pieces with it for the ends and around the shampoo box if any, otherwise use a 8' metal end piece (like schluder metal trim).
*Always use good grout and thinset.
Hope that helps...Good Luck
