You're making too much work for yourself for just a torn boot. If you're not wanting to spend the money to fix it why bother replacing a boot? You're still going to have to clean out and repack the joint with fresh grease or it's just a waste of time. Plus you need band clamping pliers. At that point you've already done more work than you would have just replacing the joint altogether.

Slap a split boot kit on there, drive it until the cv joint/axle or hub is worn out and then replace them both at the same time. You can get them both with better quality and cheaper at rockauto than the junk at the local parts store. $2 or $3 hundred at most.

If you're absolutely determined, just buy a heavy duty 1 inch drive impact. It'll come in handy for the rest of your life.

If you don't want to spend the money then:

In addition to all the bs everyone else has said (including knocking the stake out), torch, penetrant, etc., put a cheater pipe on the end of the biggest breaker bar you can find, lift the vehicle up about as far as the jack will go, set the bar so that the handle is against the ground and lower the vehicle until something busts.

Be sure to place a block under the lift point that's tall enough to keep anything from scraping the ground when the vehicle comes down.

And that's your litmus test. If the breaker bar pops before the nut then just buy a decent impact or the replacement parts.

Source: former mechanic.

Edit: Oh, if you can get a cutting tool in there, you can also cut a wedge out of the nut, use an air hammer with chisel tip. It works surprisingly well.