Changing the tranny fluid is pretty easy. If you want to see a picture and writen instructions as to how to do this go to yahoo groups "Suzuki_Burgman" group. Join if you haven't it's free. Go to files, service manual, then transmission oil at the bottom of the page.
No need to take anything apart other than the drain plug and fill level plug. You can fill the tranny through the fill level plug. Let me know if this helps.