Here is my order of operations along with sockets/sizes:
REMOVE
Remove Ground Covers (8mm Socket)
Loosen driver side steering rack bolt, remove passenger side (E12 Torx + 16mm (5/8in))
Remove heat shield plate (T25 Torx)
Unscrew Exhaust bolts (13mm Socket)
Unscrew Exhaust brace (E12 Torx)
Remove Tranny Mount Bracket from DP and Transmission
Unclamp VClamp (13mm Socket)
Remove O2 sensors (7/8in Wrench)
INSTALL
Attach tranny mount plate to new DP
Install O2 Sensors
For stock DP: Align DP bolts to exhaust (don’t tighten)
Install VClamp (don't use bolt)
Line up tranny mount points (put screws in, but don't' tighten)
Tighten VClamp
Tighten Transmission Bolts (14mm Socket)
Bolt Up exhaust loosely
Install Exhaust brace
Tighten Exhaust to DP
Install Heat plate
Install Steering rack bolts
Install Ground Covers
Reference
http://www.e90post.com/forums/showthread.php?t=104333
FWIW I do mine on a set of Race Ramps, and it usually takes about 3 hours.