speaking of a computer fan..this afternoon i tried to open a computer. and i couldnt! its too freakin hard. my friends dad is giving me a computer for free because he has to pay someone else to take it away...lol
Its not that hard
However some computers require you to have certain bits , so i would go get a jewelers screwdriver set( i think thats what its called)
Or you could just rip off the case ( if you dont plan on using it for a chassis or something) , take a hammer, a chisel, and a saw.