I want to have my sliding patio doors replaced.
I am fairly certain that the doors there now are the standard size (72" x
80").
I know little about construction and door/window sizings, rough openings,
etc...

The standard sized Andersen doors I want to get specify a rough opening of
71 1/4 x 80 is needed.
Question: the frame for the doors that I have now measure exactly 72 x 80.
Will the standard sized Andersen doors (above) fit correctly? What needs to
be done to the opening?

Thanks,
Walter