Experience with removing the dash assembly Gen IV.
Start by removing the center console. This is retained by two 13mm nuts and a 7mm bolt, behind the gear selector, and two 7mm bolts behind the remote CD/Tape deck surround/cover . This cover pulls off. You need to remove the remote CD/Tape player early on. You need to remove the CD/tape stowage first to reveal the fixings behind the gear selector, remove 4 screws under the hinged lid. You will need to disconnect a number of electrical connectors.
To remove the dash requires the steering column to be dropped down, not as bad as it sounds, release 3x13mm bolts and 1x13mm nut. There are a very few 10mm bolts (one each end of the dash, just next to the door hinges), the rest is 7mm or use a torx bit (T-15). I don't think there is a need to remove the airbag, but you should disarm it (disconnect the battery and wait at least 10 minutes). There is one large connector block (above the steering column) that you separate using the appropriate sized socket (it might be 10mm, but I am not sure.) The action of the nut forces the two halves of the connector apart. There are three long T-15s under the grille on top of the dash. These can be tricky to re-align when you put the whole thing together again.
It might be wise to protect the steering wheel with a thick towel or similar as lifting the dash out is heavy, awkward and exposes the steering wheel to sharp metal brackets.
To remove the HVAC programer requires a thin walled 7mm socket to reach a very deeply recessed nut in the center of the vacuum hoses' cluster.
Everything else is very straight forward and comes apart easily. Of course I also disconnected the battery first. I would estimate it took me a day to take it all apart and about five hours to put together. I knew what I was doing putting it all back ;-). Remember that GM build these cars fast, so the whole thing is modular and will come out as a biggish unit.
I also discovered that on removing the VIC access is gained to the sunload sensor should anyone ever need to change that. In other words given the car has the VIC option, a failed sunload sensor does not require removal of the whole dash. I don't know about non-VIC optioned cars.
The bit that took longest was re-aligning the glove box door!