How many of you have done your own installation of an undertail kit? I just got mine and the instructions leave more than a bit to be desired. I'm not a great wrench, but I'm not a total idiot with tools as long as I can see what's needed doing. Anybody know of some better details regarding the install of these kits? It 'sort of' explains the trimming that needs to be done but the pictures are very unclear and I don't want to make a balls of it.