hi guys , im ready to setup my grow, im just worried about the power, my upstairs runs off one 15amp breaker, how easy is it to add another for the grow, because my amps will overload it, can i have an idiots guide on how to add one please, also my power box is on the extension so i curious how the cable would be took, the extension is ground floor with flat roof , god knows how i would feed a cable to the first floor without it showing, ive never done electrics so need any advice please , thankyou