Super easy I just did mine I did a bit different.
That write up is perfect I was going to write one myself but I wouldn't have done any better.
If you want to do 7 lights like I did its easy.... get 7 lights lol and then cut the last 2 plugs and wire off the donor truck. Then splice in the extra two plugs to the end of the harness, leaving space.
For measurments I did very slightly different. I did 5" from the windshield instead of 5.5". Then if you want to do 5 use the spacing measurements that the write up has. If you want to do 7 like I did space the lights out 7" on centre from each one. Set all the lights on first to make sure you like what you see..
I like the Idea of 7 because that is something you can't do if your truck already has 5... I like to be different.