Cut your half meter strip of LED strip in half using flush diagonal cutters. Count the LEDs to verify there are 36 pixels on each side of the cut, and try to preserve the solder pads on the input side of one half.
Tin the solder pads and solder silicone coated wires to the input end of the piece you just cut, alternating sides for each wire to help prevent a short circuit.
Cut the input connector fro the other strip and solder four sets of wires in parallel and joined to a single piece of silicone coated wire. At the ends of these extension wires, solder four header pin prototyping wires, even though we’ll end up removing them later. Don’t forget the heat shrink tubing!
If you have a spare 5V Pro Trinket to spare, we strongly encourage you to build a prototype of your circuit on a solderless breadboard. Not only will you get a chance to test out your solder joints connecting the LED strips, but you can have a duplicate system for programming where you can easily make changes.