i just did it, it took me about 4 hours, but it was the first day ive ever worked on a quad so ull prob get it faster than me. basically, disconnect the shock, caliper, and take off the tires, then take out the swingarm bolt. i put a socket on a big threaded bolt and tightened the other end with am impact wrench to rip out the old bearings. then to get em in i had to sand down the casing and they slid right in. remember that it goes seal, spacer, bearing then the big seal on the outside of the swingarm. most importantly, dont forget to put the chain guide thingy back on, i forgot and had to take it off again to put it on haah