"Knowing everything that's not actually spelled out" just takes a little bit of experience. Worst case scenario, you tell a manager "no" and punt to the BA. The main thing about being a steward is having the nuts not to say "yes," everything else can be learned.
Too many of the guys on here that would probably be pretty damn solid sell themselves short like you just did.
I wouldn't call my reluctance to become a steward selling myself short. I also avoid it because I know that me being a steward would be a disaster for those that would have their own uncontractual agendas interrupted by someone like me.
I know our center needs someone like me who would rather just enforce the
ENTIRE contract instead of ignoring certain parts. If or when I feel there is a majority of people in the center with that mindset then I might make a move. Otherwise my stint as a steward or alternate could be very short lived. LOL.
Right now there are just too many seniority drivers that have been spoiled for far too long. I'm definitely not shy about challenging their status quos. I actually did it recently. But too much change at once with these guys is asking way too much.