The bales of pro mix that I buy at Menard's fit into a mortar mixing bin. I dump the bale into the bin, then cut away the top of the plastic and the corners. Then I give it 3-4 gallons of water. I've been doing my transplanting indoors for the past few years, and working with wet mix has helped a lot.
I don't know if it is hypoallergenic, but the construction standard for working with insulation is a cartridge-type respirator. The cartridges screw in, and are replaceable. They are somewhat pricey, but should last a while.
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