After reading this months article on interior door install I agreed with most of it and liked the hinge adjustment trick. One step that I do differently is the step for lowering the catch side. This came into play on a renovation I am wrapping up right now with 18 interior doors . I make a level line across the jamb and measure the distance down on either side and trim the jamb accordingly prior to install. On this job there are four doors right down the hall as you walk in also , in that case I draw 1 long level line as a guide to make sure all the door head jambs and trim are aligned as you look down the hall. I start were the number down to the floor is the largest so I don,t come up short in the end.