b) Yes it is possible and there are some here with good advice...

a) How noisey is noisey? Pub situations can be difficult. I think one can reasonably expect those participating in the session to keep quiet while you sing but there will always be other people in the pub not even there for the music so you will rarely be able to expect absolute silence from everyone unless you are in a separate room set aside for the music... Have you talked to other members of the session and found out how they cope with the noise levels?

Jon