Karma Controller is really easy to solder. You’ll need:
a soldering iron
and a pair of diagonal cutters
It’s also nice to have something to hold the board as you solder. You’ll also need a computer to program and use your finished Karma Controller.
Professional recommendations: Don’t skimp on the diagonal cutters, and consider getting lead-free solder. If you have sharp bits of wire on the bottom and no controller case, they’ll dig into your hands. Also, lead is a toxin.
Time to solder! Heaven or hell, round one, let’s rock!