Mary, just three? I'd don a raincoat and my rubber gardening boots, and with my lady shovel, I'd be done in 5 minutes. They don't need deep holes. Plant the rhizomes parallel with the soil surface, with the top third all along the rhizome exposed. Just be sure all the hanging roots are well buried..
Sit down and make your garden labels in advance before going out, and take them with you when you go out to plant.
I am supposed to take delivery this afternoon on a box of 4 or 5. Since it's raining right now, and we have a lower chance of rain in the mornings, I'll open the box when it arrives, soak the rhizomes in a pot of water for an hour or two to rehydrate them, then put hem back in the box with wads of soaked paper towels overnight. I'll make my labels tonight, and in the morning I'll plant them - with raincoat and boots if necessary!
