ya, manuals are nice but you have to be careful that you aren't compensating for a loose chain. If someone returns to the shop after a CCT replacement without a reasonable ammount of time passing, the cam chain will get replaced. the auto can only extend so far, if the cam chain is stretched beyond that no matter how many times you change that CCT, it'll still be loose.
cam chains aren't really that bad. they are around 20-30$ for cbr600's. i would assume a simliar cost for a gixxer. check ronayers.com or bikebandit.com
they aren't hard to change if you have all the tools and know bikes. if not then you need a shop to do it. you have to take the cams out to get the chain out then you have to re-time it when you put the new one bike it and torque the cam caps back down properly.