It's pretty easy, even if you've never done it before. Just jack the car up, take the wheel off. I recommend you get some caliper spreaders from super cheap or something, just cheap things, it doesn't matter, otherwise you will scream and throw things
http://www.vfaq.com/mods/BigBrakesInstall.html
This should give you enough info to remove the calipers. (In my experience with these things, brake caliper bolts get really stuck, prepare to bang your knuckles - if you have a breaker bar or a torque wrench, something long like that, it will help.) Just pop the old brake pads out, put the new ones in, spread the calipers apart, and re-install. Don't know the torque specs off the top of my head, but that means you have a good excuse to download the FSM hehe.
Probably a good time to drain your brake fluid and replace it, while rebleeding the brakes. You can get bleed helper kits from supercheap/repco etc, if you cant get someone to help you.
Edit : Damn, beat me to it! Hehe a much better guide than I was offering

Also some good advice in regards to long term preventative maintenance, the last time I did brake pads was on a mates astra before he sold it.. hehe.. but it DID brake 10,000 times better.