A couple things will be very useful to you. First, you need a decent disassembly guide. While we don't have repair guides, we do have a teardown that gives a basic overview of how the Xoom comes apart. Next are the tools; we sell everything that you could possibly need. Our teardown lists a spudger, and T5 and T7 Torx screwdrivers as the tools you need. You obviously know that you also need a soldering iron. You may want to use an anti-static mat and/or an anti-static wrist strap to avoid accidentally zapping the motherboard.
Other than that, the one thing you'll need is patience. You can also take pictures as you go and create some repair guides to show everyone else how to replace the charging port on their Xooms (wink wink, nudge nudge).