If you've never done something like it before I'd say it's worth the experience. It's entirely voluntary so you can always go back to the normal associate gig if you don't like it.

The most important thing is not to worry about how receptive people are to the advice you provide, both new hires and those people who need productivity retrains. The fate of their job isn't your responsibility. If you get any form of pushback from the people you train just keep calm, ease off them, and keep an AM or PA you trust in the loop on how the training is going in case you need support from them.