Even though I think that Confucius meant something other than the thought I am about to convey, his were wise words indeed. I always have prepared for such acts by studying my enemies and my options, carrying back-up weapons, preparing for disposal (ahead of time), having a plan and an alternate plan at the ready and knowing my possible escape routes.
I also have always dug more than one grave when I have set out for revenge and I have filled each that I have dug every time I have done so. Sometimes, I even have had to use each one for double duty. And here I am still standing ;>).
All the best,