Hello, I want to tap into an outlet to add some additional outlets (15 amp is what the circuit is). I want to add a plug for a garage door opener, garage lights, an additional plug in the garage, a light in the attic I am building and a light outside. I am not worried about doing the wiring myself -- however I do not know if I should be adding these outlets. Is there anything I should be worried about or doing?

Thanks,
Rob