Removing the cone nuts with two pedal spanners
I didn't bother taking a photo of the stage where I removed the track nuts; you can probably work that one out for yourself. Now, use two pedal spanners on the cone nuts. Most probably, only one will come lose. You will then need to find a way to hold the axle fast while removing the other with one pedal spanner. If you don't want to keep the axle, use something like the gripping tool I showed in the tools photo; this will damage the thread on one side. If you would like to keep the axle for future use, you'll need to be more creative.
Removing the cone nuts with two pedal spanners
I didn't bother taking a photo of the stage where I removed the track nuts; you can probably work that one out for yourself. Now, use two pedal spanners on the cone nuts. Most probably, only one will come lose. You will then need to find a way to hold the axle fast while removing the other with one pedal spanner. If you don't want to keep the axle, use something like the gripping tool I showed in the tools photo; this will damage the thread on one side. If you would like to keep the axle for future use, you'll need to be more creative.