Work top down with respect to quality.
I try to pick the negative I like the most before I got into the lab. The first work print will show if was right. By the time I have finished the print in the way I imagined it, it sets the standard for the ones following and usually keeps me from printing more than one or two more (in several copies). This way I print what mostly are the keepers.
With landscapes and architecture and other abstract stuff I even skip the contact sheets which I only find neccessary for people to judge expression and posture. But this is just me...