Yeah the walls should be easy. At least your lucky enough to have the ceiling done already though. Good Luck!

THE BUSINESS IDEA IS A +++ IM IN!

 

Hey, before the sheetrock goes up.... I'd buy a couple of rolls of insulation and put it up on the outer walls and ceiling ..... your garage will be warmer in the winter and cooler in the summer .....

 

Done!

 

DIY rocks!

I am about 2/3 of the way into a DIY house reno (3000 sq feet) and sheetrocking was one of the easier things. Only real thing to consider is making sure you get the same width sheets. Some pre '85 houses use 13 mm sheets whilst most new houses use 10mm sheets. I had to match the two widths on one wall due to time constraints and lack of supply at the local stores and it took way longer than expected to get the mudding right.

Also, if available over there, get the sheets with the beveled edge. You need less mud that way.