You need a very fine feeler gauge. Check out Ducatitech.com to see the kinds of clearences you'll be measuring before you buy one. Just decide...if you check them and they need adjustin' are you going to do it on your own or take it in to the dealer.
IMHO you shouldn't try to adjust your valves unless you know what you are doing. And if you don't know what a feeler is, you obviously don't know how to use it. (No slam intended)
Desmo valves are more complicated to adjust/check than "normal" valves. And doing it wrong can cause major damage.
Food for thought.
Wasn't Major Damage the officer in charge of bent rocker arms? Can't remember.
I do the valves myself and the first time is rather long and a bit tedious but once you got it it's easy.
You will not do any damage if you mess because you're adjusting tolerance only. Meaning if you set a .60mm gap instead of .10mm for one opener for example the engine will not run properly that's it, and yet depending on rpm; you won't break anything at all. You may break valve or valve seat if you set a closing shim that's too big and ride the bike like that, but you will hear it right away and will have the intelligence to stop the engine and rework the shim. Same thing if you drop half-rings in the oil drain, nothing will happen, it falls all the way down till it gets stuck to the oil plug magnet.
You need plenty of tools if you have none at all : many wrenches, feeler gauges, crank turning tool, digital caliper and micrometer, WoD sand papers (if you want to fine tune the closing shims and get them with <.01mm clearance)... Most importantly I advise you get a 2 valve shim kit or you'll end up going back and forth to the shop and that's a pain. Browse ebay everything can be bought there for cheap.
The 2nd time, you'll do your valves in 4 hours or less.
Funny you should mention browsing Ebay for shim kit. I just picked one up yesterday for a very good price. I was the only bidder, you can't get much better than that.
The kit I got is a lot smaller than a factory kit and a lot less expensive. It comes with 15 opening shims and 19 closing shims plus a closing shim measuring tool. Opening shims range from 2.80mm to 4.2mm, closing from 6.2 to 8.0 both in .10mm increments.
The closest dealer to me that carries Duc shims is 40 miles away so finding this kit was outstanding.
duc OEM shims are available from 2-5 mm thick in .05 mm steps, and from 4.2 - 4.7 mm in 1 mm intervals
based on this, emsduc's shims should work fine. i cannot write on the quality of his product either way, as i have no experience with it. i do think if there was a problem with his shims, we would hear about it.