You should be able to find a tool at click here I have one of these but most of the time (in my work) I prefer to use a very small screwdriver. If you look carefully at the ends of the chip, there is usually a small gap where you can gently insert the screwdriver (just a little) and lever up first one end then the other, keeping the chip as level as possible till it comes out. Make a note of which way round the chip goes before you remove it, there is usually a notch at one end. When it comes to fitting the new chip the pins usually are too wide. To make it fit, gently lay one side on a flat surface and bend them in slightly. Make sure you fit the chip the right way round and as you push the chip in check all the pins to make sure they are not bending.