I've been fencing again today. But you don't want to hear about that. You want to watch the excellent fencing scene from THE PRINCESS BRIDE.
Oh, I never told you. I was so tired yesterday, I discovered the easy way to dig a straining post hole:
1) Remove the turf with a fork.
2) Drop your pointed crowbar into the four corners of the hole and wiggle (the crowbar, not you).
3) Remove the spoil with a gloved hand.
4) Repeat steps 2 and 3 until required depth is reached.
Obviously this only works when there isn't a huge slab of rock in the way.