65 Dart Horn Problems

Ok, so with the wheel off I connect the horn and relay. If no honk, install the wheel. If no honk, install the horn switch. If no honk connect the green wire to the horn switch. If it doesn't honk until the last step then it's the switch, Is that right? Also true of false: since there's no power past the relay I won't get shocked reassembling the wheel, etc? I know these questions show how little I know about electrical but maybe I'll wind up learning a little.