Yes, you can. The basics of drywall work aren't terrible difficult, so you can do it yourself, but we recommend you use a professional drywall contractor because the DIY job is unlikely to be as strong or look ar good as a professionally completed drywall project. Drywall finishing in particular is more art than science, and is difficult to do well without a lot of experience. Unfortunately, no matter how good your drywall work is, if the finish isn't done well, the whole job looks bad.