Becuase if you still have the factory brackets and big man arms...you can't get back there too well.
I must just be flexible because I've got both of those things. I just had to concentrate on what I was doing (all I could get back there was my wrist and fingers basically to feel) and got it done. The hardest part was getting the boots off without destroying them.
1999 GTP...stock for now
2007 Suburban...far from stock
1991 GMC Dually...74k original miles. Work in progress. Far from done.
1977 C-10 (my baby)...too many mods to list