If you need drywalls installed, don't waist your time doing it yourself. The guys working on our house this week were amazingly fast in covering the walls and ceiling with dry wall. They probably created a lot more dust than I would have done, but got the job done 10 times faster.
To make the holes for electrical fit perfectly, they put up
the drywall first and then cut a hole by going around the
edge of the metal electrical box with a drill.