It is a funny story but I did the same install Friday night starting at 1030 PM.
I have worked on cars for years and have done most eveything to them but I did feel uncomfortable holding an explosive devise that could take my head off if discharged! I hope I am making everyone paranoid. Do take your spare tire out (better to learn how to do this before you have to). My terminal ground was near the air compressor tank but I did not need to move it. Disconnect the negative terminal and wrap it with a towl then a plastic bag and another towl

I do not want this ground to get a jump from anything while I am holding a package of C4 like material!
The install went great and when I pushed the bag in only one side kicked in then I used the screw driver to pop the other side. Done by 1135 PM
Great mod and great write up by X5world