The tool that makes it a lot easier is a wobble extension, so that the crowfoot on the nut can move up to 15 degrees off vertical. The wobble extensions are sold in various lengths and are very popular in the offroad vehicle segment. I have them in 3, 6 and 12 inch lengths. You would be amazed what you can get to with two wobbles on.
Ser 140142, RV-14A flying - N1463
Ser 83825, RV-8 building - N8638?
USN Ret, Urologist, AME, Repeat Offender