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It isn't very difficult if you decide to do it. Here is a nice step by step with photos of how to open up a 3GS. You should be able to do it in 10-15 minutes, and that is taking your time at it.
One thing I would mention is to be very, very careful if you use an exacto knife to open up the case - one slip and OUCH! Don't ask how I know. :-(