Pull the right side cover, drain the reservoir, pull the small access panel from underneath sled and drain crankcase (very little oil here), pull the airbox, remove the battery, remove the battery holder(you will have to unbolt the CDI bracket), remove oil filter, replace and reinstall everything.
Fill the reservoir, check the fluid by setting the dipstick in (do not screw it in to check level)
Do not pour any oil in the top of the motor, just fill the rezzy, it will take about a gallon.