In my case the height of my bridge was much too tall for what I wanted, and sanding 3/8ths of an inch from the bottom didn't sound like much fun. So using a trick I learned last year (last year's Christmas present was...you guessed it, a table saw) I set the depth of the table saw to just a little under 3/8ths and bascially used a technique for cutting rabbets to plane down the entire bottom of the bridge. Followed by a good amount of sanding to make sure it was perfectly smooth for the best possible contact with the guitar when it was reassembled.

(I almost wish I would have taken some step by step photos now to show how I had done it.)

I'm definately not what you would call a carpenter or woodworker but the lack of cash being a strong motivator I took the risk, and it has really paid off.