Need help installing french doors in finished, interior opening?

Question:I have a finished opening seperating a hallway and dining room in my home, and have purchased a pre-hung french door in order to enclose the dining area. The width and length of the french door unit is 60 in. x 80 in., and the opening measures 60 in. x 80 3/4 in. The measurement of the inside of the finished opening is of course a little wider than the side of the pre-hung door unit. Can anyone assist me with getting this unit installed and trimmed out, including what I will need to get started and finish. As always, thanks in advance!

Answers:
What is your wall thickness and how wide are you jambs? Are your walls drywalled? What kind of flooring do you have? Is the flooring the same from the hall to the dining area or is there a transition?

Guess he must have hired a pro!