There is no need to do a reset before or after. Just let the update install. IF you have issues after the update you can consider doing a reset but it's unlikely you will have any problems. I was surprised at how well the update worked. All my apps were there and working, text messages all there. Nothing lost and everything works perfectly.
brunla said:I've read a lot of posts that stated people have had issues and they had to do a factory reset which corrected them. I was just thinking ahead and see if it might be smoother to do it before installing ICS, but it sounds like doing it after is an option like you stated.