I recently fell in love with the double bass (I played bluegrass once!) and have already spent quite some time reading various topics. I plan to get a double bass now. Here's my question, and you will soon notice I don't much about double bass: what does setting up a double bass consist in? I guess the action has to be adjusted by working on the high of the nut and the bridge? Since they are not adjustable (at least the nut) is it a one time job that last for so many years? Anything else needs to be adjusted? Do you do your own setup, or systematically bring your DB to a luthier?