To take apart hard drives you need a few small Torx drivers, usually T6, T7 and T8. Usually there are a few screws that are hidden under the stickers. Feel the tops of the stickers to see if there is a screw underneath and run a razor around the outline to expose it. Once the lid is off, you usually have to take the read/write heads off to get the magnets off. Careful with these magnets, they are very strong and will probably pinch your fingers if they get between them.
Step 1: Fish tape retriever
The dental floss is great because it doesn't really knot up and its incredibly strong for how light it is. It also wraps up really tightly and doesn't unravel unless you want it to.