I did the whole thing alone over 4 days, and had never seen it done (besides Dag's very abbreviated video). I got all my printouts of Shoptalk, and the manual out. And had a good buddy in MS on the phone a few times for help and moral support. Had a Ujoint, drive shaft and pinion, but only needed the Ujoint. Had brake pads. Have jack and all tools.
Four days? Well, I took my time. I got stuck from time to time (like the wheel refusing to separate from the hub, like stabbing the new Ujoint onto the trans, fighting to get my wheel back together before realizing the new dampers were in upside down).
My fender wiring was scrubbed, so pulled that out. There was rust up under the fender so I wheeled that out and painted it. Repaired and rewrapped the wiring, and tacked it up under the fender tighter than original.
My rear caliper was a grimy mess, and I took it mostly apart and degreased and cleaned all the parts and pistons really well, and bled the rear line and topped it up, and new pads. Steel wooled the rotor.
My axle had some hard rust and corrosion so I buffed it out and greased it.
Drained and replaced the rear end dope with the drive off the bike.
Replaced the dampers in the wheel.
My license plate signal bracket to fender mount was loose and needed fixed more than tight bolts.
I flushed crud and powdered Ujoint out the swingarm drive tube. The Ujoint came out in pieces.
Cleaned and lubed the splines, and pinion, replaced Orings.
Polished my rear wheel.
Had to run it back and forth to my dealer for a new tire mount 30 miles.
Reassembled and got stuck a few more times. Antiseized every assembly nut and bolt.
This took me about three days, the fourth was to get the Ujoint boot back on.
There were no medical emergencies, but I used up a number of bandaids before remembering how good nitrile gloves are to protect your hands.
My point is even a modest mechanic can do this work, but anything you find during the job should be addressed, and it takes time to learn as you go. Dealers mostly swap parts out at top speed and clean nothing. If you like the valk and plan to keep it, this is a job every one should learn to do. Not necessarily the Ujoint (thou with it all apart, that job is easy), but everything else for rear tire changes and rear end service about every year or every new rear tire.
click each pic in the link.
http://www.rattlebars.com/mtz/ujoint.html