If you really want to get fancy, Snap-On tools makes a 3mm ball end on a 3/8 drive socket head that is 6 inches in length. I found it to be just about perfect for getting the clamps that hold the intake plumbing to the throttle bodies loose. A regular ball end hex key will work fine too, but lacking one or the other, you are not getting the intake plumbing off short of dropping the engine out of it.
It is also a good time to inspect the little wires that connect to the coil terminals, pinch them down a little bit with a pair of needle nose pliers (LIGHTLY) and put a little bit of dielectric grease on them.