Help with fuse location.

Hey I’m trying to get a Diablo tuner to tune my 2006 Sierra 2500HD with the 6.0. I need to disconnect all aftermarket accessories to do so. I have disconnected the radio but I am not sure weather I need to disconnect the remote start and trailer brake and where the fuses are for them. I have a manual and some fuse diagram printouts but nothing is apparent to me. Any help?? Thanks