Installing new switch (Noob alert)

First attempt at installing a switch coming up. Just ordered the LED bed lights from Matt Gecko. Want to be able to put them on a switch inside the cab. I purchased a CH4x4 switch. I have three available spaces next to the QI switch. Can someone direct me to a thread of how to remove/install a new switch in this location? Do i have to take a lot of the console apart or should i be able to fish the wire up once switch is opened?
Thanks

 

I dont have a 3rd gen so I cant help too much there.

But if you go to the search bar, and then click the "More..." button you will get a lot of options to help you narrow it down. For example you could search just the 3rd gen forum, or lighting

 

https://www.youtube.com/watch?v=m5N8LNerPTE