A carpenter buddy of mine has invested a good 2000 - 2500 euros in factory supplied jigs for locks and hinges.
They basically exist out of a long, thin aluminium rail you can place on the door, indexed from top or bottom, and on that rail you clamp various templates for the proper lock and the proper hinges. He then routs all the mortises with a router. It all works very quickly and the result looks very clean, like it's made by a factory CNC machine. You don't need to measure anything.
After you've done the door you can place the same jigs on the door frame, again indexed from top or bottom, replace each template for another if needed, and route the mortises on the frame. Because they're indexed by the jig, you don't need to measure anything and all mortises on both door and frame are correctly lined up.
Doesn't matter if you've got 40 years on the clock with a chissel and a drill, you're not going to top that in speed and precision. The days that a door had one lock and two hinges are also long gone. Hardwood doors often have 4 hinges and 3 separate locks or one single 3 point lock, which is a long rail which runs along the entire side of the door, locking it in 3 places with a single handle in the middle.
[attachimg=1]