I have been making so many trivial mistakes all day long.
Because I failed to get OMS installed, I had trouble with the subsequent sessions. I never really appreciated how much OMS makes life easier until I had to figure all of the commands for doing things manually.
Backups are vital. No backups, you go home early. There is no point continuing.
I lost 45 minutes in one session because I did not complete a scenario in an earlier session.
I know much less about Materialised Views than I thought. I had to leave two (2) of these scenarios incomplete.