I had a new tub installed and new tiling done in my bathroom. The tub and the green board did not meet, the tub was about 1/2 inch away from the wall/green board. The contractor tiled the wall and the first row of tiles on the tub are very cooked and angled so there is more that 1/4 inch slant on the first row of tiles. I need to retile and set the tiles straight so I may install my shower doors. Question - what do I need to do, after removing the tiles, so my tiles are straight and I may install my shower doors?