Is it hard to replace the water pump impeller on a Suzuki DT100 - or is that a job best left to a pro? I looked in the Seloc manual and don't see any step-by-step to do it. Anyone out there that did one - how long did it take? <br />The motor is about 5 years old (I only had part of last year). People who knew the boat indicate that it was hardly used. How long is it reasonable to expect pump impellers to last?