Further to what PCJM40 correctly posted, the best ‘driver’ of getting stuff like this sorted is to raise an order. (Not sure if you have done this already)
No point in trying to second guess what’s required IMHO, place your order, no need to give the sales bod what you believe to be salient details, they will make supportive noises ‘yes, well put notes to that effect on the order’ etc etc …. I can assure you the chances of these getting anywhere near the task the installer receives are slim to none.
Don’t plan some huge online task based of the install date being the day it’s in service, pessimists get more pleasant surprises in life.
The installer (hopefully OR staff) will arrive, see what’s required, discuss options etc, get wayleaves signed if required, and so forth.
It to might needs civils, it might need a second pair of hands, who knows … but the installer is the best judge of this.
Good luck.
One good thing about music, when it hits you feel no pain.