Depends on the length of the project. For almost all my edits I'll finish the edit in Final Cut and send it into Color. Then from there if its a shorter project and all my shots have the same look from shooting at the same time of day and same camera settings, ill work with one clip until I get the color how I want it, then copy that grade to all the others and make small spot adjustments as needed.
For weddings and longer pieces that don't have the same lighting in all, I go through the whole edit in the primary tab and get each shot to look as close as possible on based on exposure, saturation, rough contrast, and white balance. Then I'll move into the secondary's tab and get the grade that I want. This is where I also finalize the contrast based on the way the grade takes form. Then when I'm happy with that, I just copy that secondary tab to all the other clips and if I did a good job on the first color correction pass, everything should come out pretty much the same and how I want it. Then I just make spot corrections on clips as needed and send the final export of that back to FCP.
Then I usually edit my sound for levels and effects after my picture is locked to the main music track and add any text, credits, or titles.