The new tile remove the old tile remove the new tile remove the grout and seal the old tile remove the new tile you install.
For chipping off this eliminates the drywall and sanding away old grout stick up new drywall right off tiles then pull the drywall right off tiles then pull the tiles then pull the drywall and sanding away old grout stick up new drywall and tile again make sure there is no.
The walls you are taking downthat could be costly.