You can take the headset off your bike whithout special tools.
First you have to take off the top nut and ring with a larger wrench.

If you are not sure if you have lose balls or a bearing ring, turn the frame over and than loosen the bearing cup ring.
The balls will stay in the ring and you can take savely the cup off.
After that take out the fork, the most balls will stay in the cup and are easy to collect.
Turn the frame over into the normal possition and with a very large screwdriver and hammer you can hit the lower cup through the fork tube.
If you hit it on both sides, the cup will drop out and you can do the same with the other side.
To take off the race you must hold the fork up-side down and put it on a piece of wood.
Than with a small hammer hit the race on both sides untill it drops.
Most of the time you can clean the headset with brake cleaner and after putting on new grease it is ready for use.