What bulbs do you have out? The cluster is the easy part to change. The HVAC controls with the sliders are very difficult. There is a trick to getting the slider knobs off to get the HVAC head apart. Radio isn't too bad. You will need a soldering iron, solder sucker, and 12v mini bulbs like they sell at Radio Shock. The bulb price is like $2.00 each and pocket change vs. replacing the HVAC unit.
I have been known to just cut the old bulb's wires and solder the new bulb leads to that. Quick, dirty, works, and saves on possible PCB damage.
IMO you may want to sub this out to a speedo shop that does these every day. Get the cluster motors upgraded as well.
If you do get into this, change every single bulb. Look at the hour meter that is around 2000-3000 hours and consider average bulb life is 1000 hours. These trucks like to turn the lights on almost all the time. So the bulbs will all have high hours. 2 days after putting it back together you will find other bulbs have gone out. It doesn't hurt to burn in the new bulbs 24 hours first to make sure they will make it.