How do I learn to develop a jailbreak or unlock myself?

Here's a good link to start being a hacker: http://myne-us.blogspot.com/2010/08/from-0x90-to-0x4c454554-journey-into.html

If you want to focus only on the iPhone, you can skip the Python and Ruby sections in part 1, but add Objective-C and ARM assembler. In addition, read and understand all content on the iPhone wiki (http://www.theiphonewiki.com).

In short, forget that idea. But maybe you understand now that there are only a few people that have these skills. So don't trust[1] anybody unknown having a "new" jailbreak or unlock.

References:

  1. Whom can I trust?
last edit: 2011-03-08

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