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For starters, just use something to keep the microswitch pcb in place while you sold the wire/s. Double sided duct tape, or even a little bit of hot glue will do just fine. Your hands will also stop shaking if your arms are well rested on the table top.
On the female plug DB9 pinout:
54321 top pins
9876 bottom pins
1- (usually red) Forward
2- (u.orange) Backward
3- (u.green) Left
4- (u.yellow) Right
5- (u.black) n/a
6- (u.blue) Fire A (trigger)
7- (u.brown) +5volts
8- (u.gray) Ground (all directions and fire buttons work when shorted with this one)
9- (u.white) Fire B (top button)
The colors may vary but the pinout is always the same.
If your not sure, use a test lamp or a multimeter first to test it before you solder.
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