I did everything myself with the exception of the cluster programming. I've got a good relationship with a parts guy at one of the local dealers. He helped me verify the correct model year part numbers (I also vetted them with Chris). I purchased some stuff through my parts guy, but got the cluster and HUD unit through eBay.
It's my understanding the tach and speedo faces are glued on. I don't know if the 8" LCD screen theme colors can be changed from red to blue/green.
You will need the entire vent trim piece for the HUD buttons. For whatever reason on Tahoes, the "synthesis" silver is painted. Yukons have real overlaid aluminum.
Here's a pic of the Tahoe one.