About the top nuts, there are usually two - one above to hold the whole strut assembly to the car. Then once you take that out, there is another holing the spring seat and bearing etc.

So, undo the top one with a ring spanner while holding with an allen key, and you can take out the whole strut. Then you can dismantle with your spring compressors. Be careful...

Not sure on the bushes sorry. Any chance of a pic?