Me? I'm lazy - I copy and paste the layout of others (if they don't mind), and they usually have the HP listed. After a while, you notice the common ones - HP ice, HP electric... but I'm still not at expert level on these things yet.
You keep doing what you're doing - you're clearly good at it.
PS - if you ever need suggestions for a good BP, I've got a few projects I've been thinking about... :)