Congrats on the house, Ken....fwiw, I had a three-way switch in my last house wired wrong in the stair/hallway. Each switch worked but they wouldn't cancel each other out depending whether you were upstairs or downstairs...you'd have to go back to the same switch to turn it on or off. I bought myself one of those home electrical books with some diagrams of how to wire three-way switches. The electrician wasn't even in the ballbark when I checked both switches....I rewired according to the book after turning the power off, eazy peazy.
