If the house uses a truss roof and the trusses do not bear on the wall, no additional support is needed. De-energize the circuits, test, to be sure, then disconnect any outlets or switches. If you need to relocate a switch, be sure you understand how it works so you can route it to a different wall. Cut drywall tape and compound at the corner of any ceiling or wall and remove all drywall. Dismantle the frame. Take out the studs, base sill and top-sill, pulling any wires through the top sill. When you are done, there will be a gap in the floor finish and ceiling drywall that will need to be repaired. The wires will be hanging from the opening. Those need to be joined in enclosed junction boxes on top of the truss bottom chords. Recommended tools are reciprocating saw, hammer, pry bar, wire nuts, wire cutters.
If you need to re-route wires for switches, post back. If you don't maintain continuity in the circuits to outlets, you will probably lose power at other locations. For drywall repair, the best way is to place 1x boards across the opening in the ceiling, screw into the board through the drywall on both sides, then use that board to screw in your patch. Repeat every 16 inches. Tape and finish the patch.
Remember, we are going on what you claim is a non-support wall. If true, I cannot think of any reason to add support except as needed to hold drywall in place.