My contractor informed me that I would be responsible to install our french door into our 8foot poured concrete basement. Rough opening for the door is 60X80 inches. My contractor stated he would leave a complete opening (top to bottom) of 66 inches. This would provide enough space for 2 2X8's on either side of the door, for a nicer look. The basement is 8 feet high. Where can I find the information on how to properly install this door, as I have hung doors before, but am leary of this as this basement will soon have a modular home placed onto it, and I want to make sure the door install is done correctly. Or would this be recommended to contact a pro? Thanks for any help you may be able to provide.