The easiest way to get under the dash is to remove the passenger seat. Thats what i did and made life 100% better and no need to look like a pretzel when doing it.
The trick is to see where the wire comes up from when pulling it out. If you just yank on the climate controls, (like i did), you will have to guess where it went through to the floor. It took me 10-20 mins constantly shoving and pulling, shoving in a different location and pulling, until i was able to figure out where it went. Not fun, so pay attention to that part