Has anyone posted guides or procedures on installing a light bar. I have just ordered the two auxilary headlights and I am thinking that someone, perhaps has done this and posted some guidelines.

First question, where do I get access to disconnect the main headlight? Is it under the seat or under the tank?

 

You should get a full set of instruction with the light kit if it is coming HD. On a Fatboy the lighting wiring will likely be inside the headlamp shell/nacelle. Hook up should be pretty straight forward.