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While it’s most common to sand plaster dry, it is possible to wet-sand plaster, too. Doing so can reduce the amount of plaster dust released into the air and make it easier to work in smaller, more delicate areas (such as around wall trim). However, some people find that wet sanding leads to more imperfections, which is why larger walls are more often dry sanded to ensure an even finish.

You can usually tell if you have plaster or drywall by touch (plaster is harder, colder, and smoother than drywall) or by tapping on it (drywall sounds hollow, plaster does not). If you still cannot tell, peek under an outlet cover and check the cut edges. The rough edges show the composition of the wall. You will see either drywall (two paper sheets sandwiching gypsum material) or only plaster material (no paper sheets).

Costs depend on damage extent of damage, labor, finishing, and whether mold remediation is needed.

Yes, even if you’re being careful, removing tile can damage your drywall to some degree. However, you can minimize the damage done to it by eliminating a majority of the grout and taking your time prying each tile off. Also, it's worth noting that you might have more drywall damages to deal with if your tile is set into the mortar.