So just how hard is it to do? Both of mine are blown which really pisses me off. And about how much will the boot cost?

 

I'm assuming your talking about the tie rod end where it connects to the hub?

Don't replace the boot. It's a waste. If the boot is blown, that means the tie rod has been low on grease, which means the life has been shortened. Just replace the whole tie rod end. Not gonna cost much more, and you'll have new tie rod ends.