If you can get the old bearings pressed of the axle, it's not too difficult a job to do. The new ones are easy enough to get back on. Remember to pack them well with grease, they are sealed, and don't get lubricated by the diff oil. This you tube clip explains it well. Not the exact same model, no real difference though.
[YT]https://www.youtube.com/watch?v=2y2FnRSw3No[/YT]