Update: Three-way switch wiring had me stumped until I drew it out

I was putting in three-way switches for a hallway and kept messing up the traveler wires. After a couple failed attempts, I grabbed some paper and drew the whole circuit. Seeing it on paper made the common and traveler roles click for me. Now I sketch a quick layout before any three-way job. But I'm curious about checking the wiring faster before sealing the boxes. How do you all verify your connections quickly? I could use some tips to save time on these installs.