Hang in there through the hard stuff, and keep your ears open at all times (that only works well if the mouth is shut, lol!).
This reminds me of last night...
My sister, myself and two others were teaching airway station segments to an EMT-B class. At the end of the class, we were comparing notes and everyone had the same comment - good students, listened well, did good jobs on their station skills, with one exception. One very enthusiastic EMT recert was hell-bent on co-teaching every station. She interrupted the instructor, elaborating on the lesson for the benefit of all the newbies. She talked above and through the instructor, picking up pieces of equipment to illustrate, and going on to "teach" the next several steps. While I was explaining how to inflate the reservoir on a NRM, she had a nasal cannula in hand and was explaining to the students standing next to her how it was applied. She did a version of this at every station.
At my station I had to interrupt her when I heard her telling them that she prefers hooking up a cannula to using a mask, "because when you get to the ER they're going to change the patient over to a cannula anyway". New York has no protocol that calls for low-flow oxygen as an initial intervention - only as a contraindication. Every protocol we have calls for HIGH FLOW oxygen, so using a cannula is not ever a first choice - only a second choice (or third, etc). I corrected her, and she listened politely, but I think the underlying message was lost on her.
Anyway, the whole point is that the know-it-all EMT recert was the only one who didn't do my station correctly - she forgot to verbalize the tank pressure.
Lesson learned, I hope.