I am ready to trim a EFHW wire for the low end of 80M and I have a few basic questions. Typically how much should I trim at a time? 2" - 6" or more each try? Also do I need to fully erect the antenna up high each time to get an accurate SWR measurement? Lastly my wire goes through a clamp then the dogbone insulator and back through the other side of the clamp. Does it matter if I leave the excess wire hanging off the end of the antenna as I proceed to shorten it to tune it? I would permanently trim it and secure it after testing of course, but does it matter if I leave a foot or so excess dangling while measuring for SWR? Thanks!