First thing
after you have removed the compass, remove the clevis pin from the lever/cable. Be sure to stuff a rag into the pedistal in case you drop parts. Next move the lever back and forth, if it is stiff, most likely the bushing, if it moves freely then suspect the cables. Next move the cable up and down, if it moves freely in the sheath, you don't need to replace the cable, if stiff you may be able to lubricate as Bob said. If you do need to replace the cables, John said it, tie a strong string on the old cable when removing. Since I did not replace mine, I would say to remove the cables up from the pedistal, there is a bracket holding the shift and throttle cables together about half way down the pedistal.