Removing the instrument cluster without scratching up the wood decal is the hardest part. The wiring is not that hard to remove once the cluster is out. Is it an A/C car? Those are harder
Drop the column, pull the cluster, remove ashtray, radio and glovebox. There's some built in straps that are hard to reattach when re-installing, but it's not that bad either way.
Take lots of close-up pictures as you disassemble, especially of how the wiring is routed around components etc.
It will be a good time to deal with the Amp Gauge Bypass and Wiring Bulkhead Issues when you are in there.