foundation problems, You, not only want it to look " Good "
You, want it to be installed "Right " you will use it daily, you don't want to redo it in a few short years
You won't have to.
every shower or floor I do is done right, I have been installing tile for 27 years:
in Commercial (new & remodel)
in Residential (new & remodel)
All of the above aspects of this trade take years of trial and error to Learn & Master.
I am here to help you,
juan . montes / 817-230-3542