This is really a hard job and I wish you the best of luck. I have worked digging holes by hand with such tools before and man it is tiring. Coming upon a rock is extremely difficult sometimes, but a bar is the only way to get it out. I usually start digging the hole, only a couple of inches and add water. I then go to the next hole and do the same. After some while I come back to the first hole and the soil is very easy to take out. Sometimes the mud in my soil just comes out like water and other times it does stick to my hole digger, but it is not hard to get off either 
You do get all dirty and muddy, but you will certainly not have to use as much strength .. Again good luck on your hole digging.
Regards
Rod
North Carolina Septic Systems
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