I was reviewing the FAA's Practical Test Standards for flight instructor yesterday during my lunch break. I tried to recall the comments above and consider what patter I would use to describe the maneuvers. There was a comment above about reviewing procedures before flying; I think that certainly applies to me learning to be a multiengine instructor as well. A good bit of "chair flying" is in order.
I have a friend who is in a similar status as I was before my ME commercial checkride - single engine instrument rated private pilot and glider instructor. He's mentioned he'd like to train with me for ME commercial once I pass my checkride. I asked my instructor his thought(s) on this - a new instructor, instructing a friend... He's OK with the idea since I will be familiar with the syllabus, lesson plans, etc. But he agrees there's a bit a risk management consideration involved. (My friend is not ME rated on his private certificate, so in lieu of actual solo he will get ten hours "performing the duties of PIC" with an instructor on board. Logged as PIC with a note instead of dual.
I'm looking forward to more progress.