As a fairly frequent visitor to certain pointy jet stations, I'd concur with dinoorin.
If you are in any doubt, well really there is no doubt - don't think about it.
Better that you are shown the ropes with someone familiar and then await the invitation, far less stressful for those in the aircraft and those in light blue serge worrying what you'll do.
Mil circuits and civvy ones (in the UK) are different beasts and you really don't want to be asking what "Can you trample the cable?", means as you are sliding down final worrying about all the other important things.