Forgive me, Michael, but are you really referring to solid 3/4" tongue-and-groove flooring (pre-finished)? Or are you referring to either the laminated / engineered / floating floor that's 3/4" thick?
The reason I ask is, in my own personal opinion, unless you're very good at installing the true, solid 3/4" tongue-and-groove flooring, I wouldn't do it. That's me talking. I'm no expert but from what I've read, it takes a fair amount of experience to do this particular type of an installation. Now, if you're referring to the the engineered / laminate / floating floor, perhaps I can help. These types of 'hardwood' flooring are more suited for the do-it-yourselfer. Please post a follow-up with more specifics like Make & Model (no serial #) :)