For only $300, I'd go for it, but I'm confident I could do all the work myself (or sell the bits and pieces if the bike turns out to be a dud). Of course, only you know your money situation. Just don't overextend yourself on the purchase of the bike. Bikes can become money pits real quick, DAMHIK.
As others have said, make sure there's a clear title and all that other good paperwork stuff.
2012 Honda NC700X
; '90 PW50