Will the act of burning, cooking and/or freezing and maybe then cutting the testicles or penis result in a successful self-castration/penectomy?

http://www.newmalecontraception.org/heat-methods/

I read of a cancer patient who got testicular cancer as a result of too much heat to the testes for contraceptive purposes.

Perhaps in the same way as using a threshing machine or straddling a belt sander would result in a "successful" castration. It just depends on your definition of successful (whether you plan to breathe much the next day.)

PS. I love the drawing in your picture, are they your underpants? With a convienient guide to everything on them.

Yes. but you must be nuts (pun intended) to want to try that....

Yes, and possibly death.

One wounders if applying heat to the testicles for the periods suggested in the article, in addition to lowering sperm count would also affect the hormone production. Has anyone tried it and if so what were the results?

It seems possible to do permanent damage to the testicles with heat application just below the temperture level that would cause skin burns. perhaps wrapping the testicles to prevent damage to the sensitive scrotal skin could be used.