Easily hackable? Might have to look into that in the future, so long as we aren't talking hardware modifications.
Edit: looks like something I'd try in the future if I ever end up with a spare PS2 because I don't trust myself not to brick my current PS2 somehow, despite the instructions I found being real easy to follow.
I don't think there's much risk of bricking the system, honestly. If you wanted, you could even get a FreeMcBoot card off eBay, and avoid having to do the setup on your own system at all. That's the beauty of the mod - if you know someone who's done it, they can very easily make another modded memory card for you!
My big problem with stuff like that is I know I could probably do it, but I'm worried I'd find the one way that bricks the system. Might look into seeing how much a pre-modified card, though, since I never thought about the whole thing of them being sold online.