Nothing special. Just takes awhile your first time. Take off the skid plate if you have one, then take off the engine cover plate on the bottom of the sled. There is a drain plug, if its never been done it may be tight! start draining that and then start taking off the right side plastic so you can drain the oil resivor. Then remove air box and unbolt battery box so you can move it a little to help get to the oil filter.
Put it all back together, then add aprox 3.5-4 qts of oil to the resivor and start it up and check it. i usually add 3 qts, run it , shut it off, add another 1/2 qt and then check it. Eric