lots of youtube videos on how to install a door. also, try DIY network. however, its pretty simple. step#1. Remove old door , and frame (use a recriprocating saw to remove the screws in between the frame and the studs)#2. Insert the door, and new frame into the Rough opening and plumb the frame using wood shims. #3 inserts screws into the frame on both side to secure the door the studs (on the hinge side, use the holes left the hinges...on the latch side, place the screws behind the weatherstripping so they wont be seen)...#4. mitre and install the new trim. #5. Install the lockset and deadbolt