First you want some badass gloves. Put on a couple of longsleeved shirts, put the gloves on, and then tape the gloves to your sleeves, so its like one whole unit.

Then you want to get some big tweezers, like the kind that you use for DIY rather than bathroom ones. Just long ones, but small at the end so you can be precise.

Then you get a jar with a lid, and get some tissue paper and a rubber band. You put the tissue over the jar at first, and put a couple of real tiny hole in it. Then you put that tissue on the underneath of the jar lid, so it goes jar, tissue, lid.

You go outside, pick up that spider with the tweezers gently around the body, and drop it into the jar. You then put the lid and tissue over it, and seal the jar. Once you're inside your house, you fasten then tissue around the jar with the rubber band, and take the lid off. The jar now has the tissue paper with tiny holes in as a lid (probably dont even need the holes, air will still be able to get in through the tissue) with a rubber band keeping the tissue on.

Congratulations, you now own a black widow spider in a jar.