Personally, I try to present myself as excited for the training with some degree of competence without trying to pretend like I already know....anything? I feel like I have some trouble striking the perfect balance between competent and receptive, or maybe it's a balance between confidence and humility.

I think erring on the side of humility and receptiveness is a better bet if you're not sure where the balance is, but I'd like to hear from other folks' experiences and perspectives.

(I'd also be grateful for perspectives from folks who have been preceptors or instructors!)