I know exactly what you mean. It isn't a matter of not knowing what to expect or what needs to be done as much as it is ironing out the kinks with the first few that are bound to occur when something new is presented. That mix of being able to filter out unnecessary details, but also having learned little things to pick up on when running through your assessment.
I understand exactly where
you're coming from as well. I can tell you first hand though that all you can do is prep. For me this includes reviewing current literature, checking all of my gear every day so that when it happens, it's all as fluid as one can possibly hope.
A lot of times we'll get there, and the call these folks will most likely share with their peers, are A) nothing like they've told, and B) most likely not all that exciting.
I'm in no way lecturing you, or insinuating you aren't aware of any of this yourself. The biggest thing I can tell you about making sure to "cross your T's, and dot your I's" is literally just preparing; you'll see (if you haven't already) the all-too-common provider that doesn't. That person: don't do that.
I haven't RSI-d in who knows how long, but I still like to have all of my stuff laid out where I want it so we're not fumbling through stuff. This includes poking around at the vent in case my partner hasn't in a while.
Everyone gets rattled from time to time regardless of the call. It's healthy, it's normal, without it--as you said--you won't know what
not to do next go round unless, again, you're that arrogant prick who "never makes mistakes".
I haven't seen much serious traumas ...yet
Also, this. There's no tricks to training. Complacency kills any good provider, but again, you know that. Don't mind me..."Vent's just being Vent".