I installed the 21 circuit also. When I first saw all the wires, it was like OMG what have I got into now.
But, as stated it was an easy install. I did not follow EZ Wiring advice on clipping short at the fuse box wiring I wouldn't use or use later. I removed them just to keep wiring under the dash neater. Other than that I followed their instructions. I would recommend having a good set of wire nipper/crimpers and strippers.
