This is so simple and so fast.
Have the store steam the lobsters.
Take two dish towels.
Place one towel on your counter.
Put the lobster claws and knuckles on a towel.
Cover with another towel.
Then take your rubber mallet and bang each shell till it cracks.
Take the top towel off and you have all these cracked shells that the lobster meat just falls out of.
Take a scissor to the soft part of the tail and cut it down the center.
Pull the meat out.
One lobster takes maybe five minutes.
Use the small legs, shells and bodies for a delicious stock.