I learned a lesson!From now on I will always use pre-hung doors.
It took me the better part of a day to do the two interior doors on the main floor - and less than a half day to do all five doors in the basement.
What was the difference? Simple! the basement doors were all pre-hung doors. Installing the pre-hung doors was a snap - just level, install the door and then the door knob.
The prehung doors were a lot of work, and not being a pro door installer they a a bit 'sticky'.
;-)