My client Ken is a treat to work with. He brings in sessions off his standalone digital multitrack with each song on a CD-R, clearly labeled, a binder with track notes including how everything was mic'ed and how far away the mic was, brings the DAW just in case (with manual), and the whole mixing session proceeds in a very organized pattern. It's always forward motion and we get a lot of work done in a day. His being prepared makes the session run smooth, and any troubles we run into get worked out pretty fast.
I remember the day well. I was sitting next to my washing machine, a Tascam 38 on my right, a Soundcraft Spirit Folio RacPac mixer in front of me. I was recording a friend in my basement studio. For the first time in my life I realized I needed to grab a piece of paper and note what instruments were recorded on which tracks, and that I needed to have a sheet for every song.