We hired electricians to install some recessed lighting in our living room. For complicated reasons, they will not be finishing the job, which only involves installing the dimmer switches and plugging in the new lights, something I'm capable of doing.
They ran two pairs of romex wire (there are two separate sets of lights to be controlled) to a gang box that holds a switch for a light that will no longer be used (I capped the wires and put a plate over it).
In my mind they were planning on using this switch to send power to the lights. However, upon looking in the box, the switch that controls the old light seems to be just completing the hot wire, as there is no neutral wires twisted in there.
In my head if I twist together the black/black and white/white wires at the old light's junction box, the black/white pair in the gang box will give me the hot/neutral that I need.