Not a difficult job at all. Best if you have the correct deep socket to loosen the controls from the control plate, using pliers will likely get you a scratched plate. Just keep note of the orientation of the controls on the backside of the plate. If you put the controls on with them clocked wrong, the new assembly may not fit back on the bass. Put a layer of tape on the tip end of your socket and you won't have to worry about scratching your new control plate.
Best to do your own work on your instruments whenever possible, you'll have a better understanding of exactly what is going on whenever you have issues with your bass.