Pirating Windows 7: easy?

I had to ditch my Windows 7 install a few months back and switched to various Linux distros instead. After a few months of that bullshit I'm about ready to suck Bill Gates' cock if it will get me back to W7. My W7 install was part of some special offer thing so I don't have a CD or anything to install it from, so I'm considering pirating.

How doable is it? Does the install  usually end up pretty fucked up or buggy, or has it worked smoothly in your experiences?

Or you could use a pre-cracked copy from the Pirate Bay or something. A chance there'll be malware, but there's never been in my experience.