Not too bad really. Watch some videos, take your time. Take alot of pictures before your disassemble. I had to replace one closing shim. Installed new belts, spark plugs, coolant, oil, fork seals and oil, rear hub service, probably a few other smaller things along the way. I had all winter so I took my time. Probably have 25 hours in it, possibly more. I understand why it costs so much at the dealership now.
Next time I will be purchasing a shim kit, I spent basically $50.00 on a shim measuring tool and 2 shims. (buy one + and one - the size shim you think you need)
Also, 4 paint sticks wedged between vertical cyl intake cam and flat surface on head keeps the cam in place when removing the belt of vert cyl, there is no tension on vert exhaust cam. Also there is no tension on the horizontal cyl pulleys when motor is on compression stroke of horizontal cyl. (that is your "home" position)
And never mind the dot on crank lay pulley. It doesn't line up every time. The marks on cams are important tho.
I watched this one a few times....