Materials: Iron hoe (if above level fifty use diamond), two pieces of dirt, iron block anvil, materials to repair your hoe with, and a double chest
Step 1: Place two pieces of dirt at your foot level.
Step 2: Place your double chest on the two pieces of dirt.
Step 3: Place anvil.
Step 4: Whip out that hoe.
Step 5: Hold right click and place cursor on the lip of dirt the chest exposes and in exact middle of two pieces of dirt.
This should cause the land to alternate between plowed and normal so all you have to do is stay still, hold down right click and your hoe should be used up in about a minute.
Step 6: Now that the hoe's durability is very low (press F3 and h at the same time to show exact durability) you can repair it.
I find this is a simple way to level up your repair very quickly and easily comment on the post if you feel I have left anything out.