Well, that majorly depends on the hand you are holding, no?
In tournaments when it's getting tough, that's not so true, because sooner or later you just have to move in and hope for the best.
But it ring games, if you are utg you have to play extra carefully. play great hands like AA KK or QQ agressively, fold any hands that don't have real value like suited connectors.
Think about calling raises with AK or AQ, just don't do that too often. They are not so good hands in utg position.
Hardest is to play pocket pairs that are small. If the raise is not that big, you should call and if it's big you should fold. In normal situations without raise you just call and see what the rest of the table will do... Decide from that.
I am writing an article on starting poker hands, published two parts now in my blog 100kpoker » Introduction
Next part will be about card hand values according to position you are in. You can visit and read if you like.
Hope this answered your question