Also, the bolts are designed to break in a crash, don't substitute ones you have lying around...Look inside the aluminum fairing stay ears. There is a rubber pad on each one. Pull those off to access the wiring for the turn signals. They disconnect easily enough. Remove the allen screw on each mirror, also accessed on the inside part of the fairing stay ears. As said above, once that is done, just give a persistent pull until they pop off. Gently pull the turn signal wiring through the lower hole, and done.
When reinstalling, be careful not to over-tighten those allen screws. There is a threaded sleeve in the mirror stalk where those screws go. If you over-tighten them, you can break that threaded sleeve loose and it will just spin inside the stalk as you try to tighten and/or loosen.