Good deal! Plus there will be a lot of other children there so don't fear. You'll have some children running up and down, some children crying and some throwing books. So have no fear! You kids will really love it. My library had a seperate sound-proof room just for story time (I guess we were that loud! :)
Anyway, once you go you will then be introduced to other mothers and that's where I met a lot of my son's playdate friends. Have fun and good luck! :)

Yea! That's cool that they have the library studygroups for the younger kiddos. Maybe you'll meet and start building a support group of Mommies in your area. Who needs those mean ole' in-laws anyway! Let us know how it goes...
I work with young children, daily... I don't know how you handle 4 all day every day... You must be super consistent and organized! Do you get to sleep?!?! ;)