I don't think swapping axles is that hard.... just leave the wheels on!! Just a case of the rolling the old axle out and fitting the 'new' one.
Ok not quite a simple....
Esp. if you've only got one set of wheels, one drag link bar, and one set of radius arms.
But not far off....
If I was to do it again:
Loosen the two big nuts that hold the radius arms (don't remove them, just loosen them a few turns) Though you could remove the rubber bushes from the nut side - but then put the nut back on a couple of turns.
Loosen the bolts that hold the panhard bar
Disconnect front prop and cable tie out of the way.
Remove the bolts on the bottom of the front shocks (and the tops if you want to take the shocks off completely - probably easiest IMHO)
Lift the front of the landy and put it on axle stands (under the chassis)
With the jack under the front axle, take the wheels off and disconnect the brake pipes.
Disconnect the drag bar from the steering box to the front of the swivel (easiest to do wheel end)
Lower the axle back down on the jack - you should now be able to remove the springs and shocks (or at least move the shocks out of the way.
Lift the axle back up on the jack and refit the wheels (you only need a couple of nuts on each wheel)
Then lower the axle back down, should then sit on the wheels.
Remove the panhard bar
Remove the nuts from the end of the radius arms.
You should now be able to roll the axle out from under the land rover.
(Just make sure the landy is correctly supported by the axle stands)
Then just reverse the process to put the new axle on.
Though you will probably need to put the jack under the axle to get the radius arms to go into their holes in the chassis
Obviously it makes life easier if you've got wheels on both axles.
If you need to swap the radius arms over (and other bits) make you loosen any nuts whilst the original axle is still on the vehicle.
This is just how I would do it, so people may have better methods.
It is a struggle to do it without having a rolling axle with wheels... a complete front axle is blinkin heavy!!!!
Ian