re: DIYers, how hard is it to replace an exterior door?

Doors are one of those things that look simple but you definitely need to know the tricks of the trade to do them right and in a reasonable amount of time. I got to where I could hang and trim out an interior door in under 15 minutes. Exterior doors are much harder simply because you don't have the level freedom to adjust them to the rough opening like you would an interior door.