They really are relatively easy maintenance to accomplish. The water pump should be easy to remove and then open the casing to change the impeller. Just use plenty of lubricant to get the new impleller in the casing. I used vasoline and it worked well. The oil is easy with a little help of a drain kit to get the oil out and to a container. The kits are about 18.00 from Overtons, not the pumps just the hoses that screw into place and allow you to drain the oil out the plug passage for draining your bilge. Good Luck!