There is a lot of help available for people coming up for their upgrades on the line, they only have to ask. I've never, ever, been asked by a candidate coming up for upgrade if they can do the cabin crew brief or fill in the tech log for example. They are small things but if you can do the normal stuff without having to think about it too much you have more spare capacity to deal with the unusual.
Similarly, it is very rare to be asked "What would you do if.....". I'm not a trainer so I wouldn't pretend to have all the answers but I think most Captains would be happy to have a chat if asked.
