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1. I used a really small flathead. I think they make a special tri-wing screwdriver, but I couldn't find one.

2. You use the hot tip of the gun to melt a bit of solder fastening the wires to the holes in the board.

3. See #2

If you haven't soldered before, try googling a "soldering how-to" to get you started. Once you feel comfortable with the basics of that, then you'd be ready to move on to a project like this.

Hope this helps! If you have any more questions, let me know.