Hi
Can not understand how valves can be to loose? Then they must have been far out of spec from factory! Checked and adjusted valves at 10k. on my -05 Rocket. 4 valves too tight, the rest within spec. I guess there are no shim kits for Rockets, shims are the same as on earlier Triumphs. (and Honda, Kawas).
The work itself is very straight forward. The Rocket engine is very simple in its construction. But of course, service manual is needed, at least for torques values, and to set valve timing correct.