About electricity;
I used to work with a group of growers, I was the construction/drywall guy, we had an electrician, two distributors and three gardeners. Seven gardens in total.
I learned electricity from automotive applications, which is DC, so it didn't help me at all with standard AC, like in all US homes.
Working closely with the electrician, (we also rehabbed homes), I learned all the basics of setting up a subpanel, and running new lines.
If you aren't going to pull tons of juice, ie more than 4 x 600W, I'd recommend splicing into an already existing line, installing a junction box and running a new line to an outlet.
If you have a line that goes to a bedroom, where there isn't a lot of energy being used, turn it off at the panel, find the lead wire, and cut it in half, and splice another line into it making a 3 way connection. Use wire nuts and keep the connection inside a junction box. Run the newly installed line to wherever you want the outlet, and voila.
It's really not that hard to splice in a new line, if you only are running a couple lights, this is your easiest solution.
Tips;
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when messing with lines that may be live, only use one hand. Keep your other hand free, away from any ground. Reason being, if you get shocked, it will look for the easiest way of traveling out to a ground, if your other hand is grounded, the electricity might pass directly over your chest (heart) and out the other hand, possibly stopping your heart. If you keep your hand free, you'll just get a little jolt to just your hand, and forearm.
- :s give yourself a little extra wire, you'll need to trim off for connections, and more is better than less so you don't run out of length.
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get youself a voltage meter/tester, and a nice wire stripper, Kline tools are the best imo.
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get a do-it-yourself guide to electricity, it explains almost everything.