Very easy to do took me all but 4 hours to do. As Wild and Free said just unbolt the column and lay it on the seat and unbolt the dash and pull the passenger side up and away. I used a bungee cord and used the passenger side oh crap handle to hold the dash up and out of the way. I'm pretty sure you can handle it MoparMan.  I will look for the write up I had but cant guarantee I can find it. 
 
---------- Post added at 06:30 PM ---------- Previous post was at 06:26 PM ---------- 
 
Still had it bookmarked. 
 
 
Evaporator Core remove/replace in dodge 1500 truck 1995-01. I can pull  it in 3.5 hours. putting it back takes about 2 hours, plus charging the  AC, about one more hour more. Having a friend around really helps.  Disconnect the battery before attempting any work to avoid a short. 
1)Remove first screw on plastic door sill on both sides. (the things on  top of rug where door closes)Remove kick panels. 
2)Remove panel under steering wheel. 
3)Remove two nuts holding up steering wheel. 
4)Remove screws where windshield meets dash board. 
5)Remove 2 bolts left and right under dash but against sides of car  (under kick panels). 
6)Dashboard is now loose and can be pulled towards the seats. 
7)On right side of dash hook a wire way up to screw that holds moulding  clips, or pull the dash towards the seat and put a jackstand under the  passenger side. 
8)The whole heater box is now visible. 
9) You've got to remove vacuum lines, controls, and electric plugs from  heater box. 
10) Now the secret: there are 2 screws holding it to fire wall on inside  (one has a ground wire attached). The other is in the upper right hand  corner facing up. 
11) there are 4 nuts holding it from engine side of firewall(one is  behind the electric panel on the passanger side). Remove all four of  these. 
12) Remove heater hose clamps with a hose clamp plier. This will take  time, these clips are a >edit< to get off. 
13) Drain the AC freon. 
14)the AC lines require a special tool that costs $9-12 at parts store.  the kit has 6 plastic widgets. use the one that fits. play with an AC  fitting near the radiator for practice first. 
15) you should be able to pull the heater box out now. 
16) Remember the dashboard is just pulled up high enough on the right to  get at the heater box. 
17) It is a good idea to change the heater core while doing this job.  They are both in the same box.