The strimer plus tutorial at srgbmods is awesome and easy to follow, but soldering wires to the pins on the male JST PH plug is a pain and very unreliable over time.
While I bought my parts in Japan, I essentially ended up getting a cable set similar to this
You then solder the cable to whatever controller you use and connect the male plug into the female plug as a gender bender and you have a much easier and more reliable connection.
Consider adding a bit of glue there to make sure the male plug don’t fall off and you turn it around in the wrong direction later!
This cuts the whole project time probably into 1/3.
Feel free to add this to the tutorial on srgbmods.net!