Hi looo...
Yeah from looking at the pic I posted yours is gonna be pretty easy to clean. remove the battery first, then remove all the screws that hold that big panel on and lift it out and you should have clear access to the fan. a can of compressed air and a natural bristle brush (soft paint brush or make up brush is ideal) should get all the rubbish out fairly easily. as I said before make sure the fan doesn't spin up when you blast it with the air otherwise you can damage things.
The fan will suck air in from the bottom and blow it out through the heatsink on the side of the laptop (the heatsink is a metal thing with fins see pic...
http://www.insidemyla...d-laptop-heatsink.jpg )... the one in that pic is very clogged up! as the air is blowing from the bottom and out the side you want to blow the air back the other way to clear the fluff otherwise you'll just blow it deeper into the heatsink...
Give it a crack, it's not going to be a hard job by the looks :)