Quite a learning experience. Instructions are too often written by technical people without being tested on the people who will be needing the information. The things that are assumed are the things that us beginners get tripped up on.
This experience has rejuvenated my efforts at making my own blueprints more self explanatory. Too often, the Drawing Legend and List of Abbreviations get copied from job to job without being read and updated. Years go by and the symbols used on the drawings no longer match the symbols used on the plans.