how to straighten steering wheel?

[Daves72'GMC]

I had my 72' 3/4 GMC truck restored and the the guy that restored it didn't mark where the shaft came off the steering box. I still have to take the truck down to have it aligned. After it is aligned what is the best way to straighten the steering wheel if its not straight?, and if I have to take the steering wheel off to straighten it, how do I do this and how does the GMC emblem in the middle of the steering wheel come off.?Thank you all.