I used one of these on a recent build. The biggest challenge was depth, make sure it fits in the body. They are momentary switches, so they only close the contacts when the button is pressed, which doesn't make them useful for any real on/off or coil tap uses, but they are great for kill switches.
For "press the button to kill the signal", just do
OutputJackHotLead -> Switch (C&NO Contacts) -> Ground
I prefer to wire it in series with a toggle switch so that you toggle the switch to enable the kill button then you "press the button to make noise (let go and the signal dies)", just do
OutputJackHotLead -> ToggleSwitch -> Switch (C&NC Contacts) -> Ground
I like that second configuration because it's much easier for me to press a button on a beat than to release a button on a beat, and you can do some cool effects.
Hope that helps.