My Conductor's Special was installed in January 2010. I installed the system and ran the airlines myself and my mechanic wired it up for me.
I fabricated four brackets, first making templates out of cardboard and thin plywood. Then I used them as a pattern to go by when I made each custom bracket. It worked out well and looks like a factory job.
My vehicle is a 5-speed 2004 F-150 XLT 4x4 short bed. As well as the horn kit, I have a Line-X spray in bed liner and UWS tool box.
As far as comments or tips, just take your time and give it a lot of thought. Some people put the compressor and tank in the tool box on a rig like mine. I was determined not to do that, so I made a bracket for the tank and compressor to go along the frame rail on the shotgun side of the cab. I made it out of 10ga sheet metal and put gussets in it for extra strength. I also cut a hole in the base to access the drain cock. The other brackets are made of grade 304 stainless steel so I did not have to paint them. it doesn't take a lot of material, I just scrounged a little from a scrap pile.
Any good mechanic shop can wire it for you, using the supplied instructions that came with the kit. Being able to fabricate my own brackets and mount the components myself saved a ton of money. I am a welder by trade with over 35 years of experience.