I have never removed a window on either of my Q45s and have no experience with any of the newer years, but I have pulled the front windows on both of my trucks.
I assume the process is similar. Unbolt the window from the regulator, rotate it sideways, and gently get it out. My trucks have been substantially simpler door wise (manual locks, mirrors, and windows) - but I suspect it's pretty much the same process.
Does the 05 have the "buttons" that fit through the glass? If so you have to remove those somehow. I would download the FSM at
http://www.nicoclub.com/FSM/ to get the correct procedure.
Heath