How do you play a demo?

I just got a PSP.. and now I'm wondering what steps I have to take inorder to play a demo?

(currently only have a PSP.. but will buy 1 gig mem card duo)

Thanks if replied. 

Well first you have to download the demo onto your pc (dont think you can do it directly to your psp but i may be wrong) and it's most likely a .zip file so you 'unzip' it with a program like winrar (google it).

Once you unzip it you'll end up with a folder that is labeled as what looks like a bunch of random numbers and letters--something like ULUS109001 or what have you.  Once you have that, connect your psp to your pc via usb, and open the psp in 'my computer' and i believe the the location you want the demo to go is psp/game/