When the chip is fresh from the factory it is already in ISP mode.

Make sure the first program you load has 'the backdoor' at the very beginning then you are in business.

Forget AN-461, it tell you a lot of stuff you do not need if you use FlashMagic and NoTouch/the backdoor.

Agter some time you may want to visit AN-461 just to know what you are actually doing, but following the above recipe there is no need.

Erik