Two VERY helpful links.
For #2 in above post -
"Backing a 5er" - Dennis M M from 2007And from a "professional" site, with diagrams, etc.....
Newbie Driver - "Backing...Is it really that hard?"See 45 Degree "Alley Dock"
Really important statement and diagram there for item "C" (error) & reaction time:
"Once you turn the steering wheel in one direction or the other, the trailer does 
not immediately respond.  It takes 6-8 feet before it does, minimum.  This back cannot be fixed going backwards....
it must be fixed by a pull up."..;)
~