You can remove the clock without removing other instruments but as x_atlas0 stated, tiny hands help. Remove under dash cover, loosen two thumbscrews (or one if you are lucky), unplug wires, twist, and then rotate it fifteen different ways until it will drop down. And have a supply of antiseptic and band-aids after as well! The question would then be, how much to adjust unless you leave it hooked up to a power supply on the workbench. When reinstalling, pre-tighten one of the screws so you don't have to reach for it, just tighten the remaining accessible screw.