yes you can keep the sd card in, nothing on the sd card will be affected.
and I know it sucks you will have to redo all the settings as well as redownload the apps but as mentioned in the long run it will clear things up to work with the shabby mod better.
Okay, have to take the good with the bad, I guess...not a problem. So is that it, do I have to do anything else now, other than enjoy the phone and drain the battery by playing around with it...lol?
! Glad you decided to take the plunge while Optimus and Shabby were around . You had two of the best in this Forum to walk you through what needed to be done . YOU GO GIRL (lol) and welcome to the world of ROOT ! Your journey has just begun !
I think I did it when I was moving apps around. If it's an easy fix, that's great - if not, well it'll be time for me to continue learning how to do things on my phone. 
I like exploring things on my phone now, but am being careful what I press and what I don't...I haven't done the boot sound thingy yet, too busy nosing around on the phone I guess. 