not that hard. gotta pull the motor, pull the head and the pan. get a ridge reamer to take down the ridge at the top of the cylinder. from there pull the pistons one at a time making sure you pay attention to their orientation in the cylinder. pull the old rings off. be carefull you dont want to scrape any of the aluminum off of the cylinder. clean the ring lands well, make sure the holes in the oil ring are clear and re install the new rings. they can go on more then one way but there is only one right way to put them back on. if you do it wrong you will still have smoke and oil in the cylinder and low compression. get a ring compressor and tighten it down on the piston and tap the piston back into the cylinder carefully with a piece of wood or i like to use a wood handled hammer. a good safety tip is to put some rubber line on the connecting rod bolts so they dont nick the crank. snug them up and move on to the next cylinder. i get them all snug then go over all of them and torque them down once they are all done. make sure you put the caps back on the connecting rods the way they came off too. otherwise your bearing will spin.