Yeah, and if you are unlucky enough to have one or more clearances out of spec, you'll need to pull the camshafts to access the shim.....UNLESS you have the required special tool.
Although you can get the tool from Toyota (break out your checkbook!), it is also available from Snap-On (as part of their "Blue Point" line of tools) for around 40 bucks, IIRC. I've never used the Toyota tool but I can tell you that the Blue Point tool definitely takes some getting used to.