You do need to create both a magic memory stick and softmod your battery. This isn't really risky at all. Worst case scenario is you semi-brick your phat and you just recreate your mem stick and unbrick it. Just make sure you follow instructions carefully. Both the memory stick and your battery can be unmodded pretty easily, although I had an issue unmodding my PSP Slim battery for a little bit.
Also, if you have a slim, just know that you're going to have to hold the battery in, since it doesn't fit perfectly in the phat. If you both have phats, then ignore what I just said.
This tutorial is pretty decent:
http://forums.qj.net/f-guides-hacks-...ry-118799.html
However, there are zips downloadable for your memory stick that will automatically downgrade to 3.71m33. I can't recall just now where to find them though.
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