Buy a gregory's which has the photo's and diagram etc. But here is a decent rundown.
1. Jack car up so wheels are off the ground. Ensure car will not MOVE as rear wheels (handbrake) will be in the air.
2. Remove wheel/s of axle/s to be removed (handbrake on helps)
3. Remove brake drum (disengage handbrake first) by trying to pull off. If it doesn't pull off, wedge with a screwdriver, tap with hammer.
If all else fails, screw in two bolts (size I'm unsure) into the tapped thread into the drum on the face of it, which will push drum off.
4. Unbolt axles by using an extension bar on a socket to go through the holes in the stud plate. There are four bolts holding in the axle.
Just spin the stud plate to line up the bolts to where you need it.
5. PULL! If you can't get it off, keep trying.
Clearly you've already done these steps, though. (You asked for a step by step procedure and there's not much else after the pull bit)
Seriously, just try harder. It's not going to fall out. Have you jimmied it with anything? Take some photo's of where you're up to and
what's been unbolted on the "Both sides were the drums connect to the shafts are undone".