you won't have to actually take your bike out of time to check your valve clearance, only if you actually have to replace shims to change the clearance back to spec
what i'd do is get down to and remove your valve cover, and then you can rotate the motor with the timing hole on the right side, just turn the motor over so that you can check each vavle's clearance against the manual
generally unless your bike has been sluggish lately you won't have to swap out shims.
then, push down on the cam chain in between the camshaft sprockets while you remove the CCT. this will keep the loose chain from jumping any teeth so you won't go out of time. then replace the tensioner with a manually adjustable unit and reassemble your bike.
if you do need to replace shims, you'll have to take the cams out to get to the buckets. look in your service manual for details about this bc it's a little more indepth than i'd like to go into on a post.
if that's the case just email me at email@example.com
and i'll talk ya through it.