I load all my ammo on a Dillon 550. I do 4 operations on the press - FL-size (though I've been testing doing this step separately), mandrel/neck size, powder drop, and seat. I've been priming on the Dillon as well, though I've been experimenting lately with priming the brass before going to the press as well.
If you really want to get into it, @Scott Harris did an awesome write-up on building precision ammo on a progressive (Dillon 550) that is more or less the "bible" on the subject (IMO).
I use this same method. I decap on a single stage press. I don't resize separately. I also prime separately and not with the press.