i read a thread on here about things that were funny or annoying in labour or something like that (i wished i'd saved it).
from that thread, i informed DH to stay away from 'the business end', dont snack have tea if i can have any (MW did offer, i gave him a look, he politely declined), explained i may poo, what the show or plug was and where to find stuff in the hospital bag. also not to feel rejected if i dont want to be touched (which i didnt).
also made sure he know what pain releif i wanted, in case i was in too much or a state, he could ask for it for me.
we went to hospital antenatal classes, and visited the ward before labour, both of which dh found useful.
i think dh found the hardest thing was to watch me in such pain and not be able to stop it or help me. he felt helpless.
but he was so supportive, he did everything i asked of him, didnt seem fased by the goo of childbirth and was, outwardly at least, quite calm.
he also had a lot of pressure from friends and family who wanted to know how things were going, when things werten't going great. he handled it so well. despite having very little sleep for 3 days.
i'm not sure if this is along the lines of what you were looking for, but i hope it helps.