I want to take a shower!?
Answers:
no you do not have to tape the joints behind the shower walls.but i would just to get the practice.as for the other joints,web taping works best.add some joint compound,then tape.useing 6 in. putty knife smooth tape,removing excess compound when dry ,sand,then add 2nd coat of compound with 8" blade,dry,sand,and repeat with a 12" blade.it takes a while to get it down,but what better wayu to learn then to get your hands dirty.youll do fine. good luck
p.s.
there is a certain sand paper that u use for compound.just ask at you local hardware store.
Other answers:
how does one build a sand pit if one hasnt done any such work.?