2000 Polaris xplorer 400 4x4 coolant leak

[Jeff Cotter]

I recently purchased a 2000 polaris xplorer 400 4x4.  When I bought it the starter was bad, speedometer didn't work,  and it had been sitting for 5 years. I replaced the battery, and starter. Changed all fluids, and got it running correctly.  Then replaced the speedometer in an attempt to make sure the awd would be available when needed.  And took it out for a couple hour ride with a buddy.  

It ran great that ride with no serious problems just a little carb issues which I was able to take care of on the trails.  Then a couple days later I decided to take it out for a ride by myself,  again ran great no issues other than a couple times it seemed to cough and then take off again.  That day when I was loading it I noticed coolant dripping onto the trailer and the overflow bottle was empty.  

Got home and decided to drain the counter balancer, when I did that I got about 3 cups of coolant. Im guessing that it needs new seals and all for the water pump.

My question is how difficult is it to do the water pump and should I attempt it or should I send it down the road to the polaris dealership to get it done?