Three ways to get them off:
#1, Stewart & Mc Donald sells a special designed knob puller that as you put the slotted fork type bracket on the bottom of the knob the top has like a bolt that pushes up the knob of the knural of the shaft of the pot.
#2, Put the end of your tee shirt around the bottom of the knob and twist the tee shirt end until you can' t twist any more. Than proceed to pull up the tee shirt end until the knob comes off the pot shaft. (it's hard alot of times they don't come off easy).
#3, And I don't recommend this if you are not going to replace the knobs. Get a piece of flat plastic( like an old pick guard or a piece of a waste basket) place on the guitar. With a flathead screw driver pry up the knob until it losens and take off the knob. If you do not have a thick enough piece of plastic you will put a dent on your Paul's top. Also the bottom of the knobs get chewed.
Good luck.
Bootlegger.
Bootlegger guitars.