All the training in the world means squat, if the rescuer panics too. Even with training a real life mishap depends more on the rescuers willingness to do something rather than nothing.
I think (my opinion only) training is more about learning so that the rescuer (aka student) doesn't panic. If you are armed with the knowledge and know how to respond, you are less likely to panic yourself. Training is just that. Real life and death issues need to be dealt with. The good news is that you are not living in a TV hospital drama where every day you are going to be bombarded by doom and gloom every minute.
After you complete your training you will be armed with the knowledge of how to react IF life tosses a curve your way. I completed SSI's stress and rescue course several years ago. I approached eveything a little diffrent and give a little fore thought into things, I look at other divers and learn from the ones that have something to offer, and keep a watchful eye on the ones I may question. The good news is that I can honestly say that to date, I have not had to "rescue" anyone, but I was able to help and support other divers when they were overwelmed with it all (and needed to abort the dive) or just needed a friendly underwater adjustment (loose tanks mostly), and assist when necessary.
If you have the opportunity afth the course volunteer as the next's course victim. It will give you a diffrent perspective, and give yourself the chance to refresh what you have learned.
I am fortunate in that I have never been in a sitituation I haven't gotten myself out of. And man there are a few stories there.
I seem to have rambled a bit, but I really am supporting you and your effort to complete the course and continue with you diving goals. IOt may be unwanted advise and I apologize for that.
Best of luck!!!