Lupe, your original question was do you
know how to check/adjust valves? I'm going to give you a different perspective to look at.
I've done everything that includes what is listed in the service manual all the way thru what is completed by the 40,000 mi service myself, EXCEPT the valve clearance check/adjust. I've done many of my own modifications including, as you know, a complete custom paint. My point being, I
know how to do the valves, BUT here's the rub. Our local dealership is a H/D-Triumph dealership. They stock NOTHING for Triumph parts. I even had to have them order $1.20 banjo washers for the fuel line to the tank

So if I was to check my valve clearances & find i need a certain size shim, or 3 or 6... They will not have that size & hafta order them and I don't wanna wait!
So I took it to RPM Cycle in Dallas. 2.5 Hours book time (would take me 5 probably) @ $110.00 per hour = $275.00, $30.00 valve cover gasket, $20 worth of bolt washer rubbers = $325 Total cost.
So when you look at how much time it's going to take you + more than likely having to figure out what size shims you need (equals the difference in how far out of tolerance you are + what size shim you have in yours) & probably having to have your dealer order them, unless they stock every size so they'll have the ones you need - or ordering them yourself, that equals more time the bike is down. And if you were going to replace the valve cover gasket & bolt rubbers anyway, you would really just be out an additional $275.00 for their labor (they don't charge for any shims needed - that's included in the $275. Mine needed 3)
It was THE SMARTEST $275.00 I've spent on my R3 so far