Work from the door/entrance and go around the room in a consistent direction. It doesn't matter if you go clockwise or counter clockwise, just be consistent.
I use the backs of short cutoffs instead of note pads, they are easier to jam in your pocket.
Try to always face copes away from the door, they are less visible that way, and first impressions last.
Practice cutting copes on scrap in your spare time until you can quickly get them right the first time, every time. And, I mean evenings and weekends.
Taunton/Fine Homebuilding publishes some very good books on doing trim/finish work. Their "For Pros by Pros" series is very good. And, they have lots of articles available online if you get a membership on their website. I think you can still join for thirty days as a trial for free.