If you can give more details, like what cables go where at present, it
might be possible to give you some pointers. If the garage wiring is all
run on the surface, it should be easy to work out.
Wiring another light off an existing one should be straightforward. But
still needs to be done right and how it is done will depend on how the
exisitng wiring has been done.
Incorporating a 2 gang switch could actually be easier than just wiring
off the existing fitting or could be a lot more complicated. It depends
again on how the existing system has been wired.
The usual caveats about how dangerous electricity is apply and that you
need to be totally confident and competent about what you are doing.
Think of it as jumping out of a plane with a parachute and /hoping/ you
packed it properly..
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