Gunzo: I shucked Oysters for pleasure going on 50 years - the best advice I can give is buy the most expensive Oyster Knife you can find!
I actually prefer and eat most of the Oysters I consume after being baked in an oven or over a big bed of coals!
They indeed do open themselves when prepared thusly.
But on some shores the Oysters must be shucked on the beach and the shells put back about where they came from - here is where the best (most expensive usually!) Oyster Knife you can find will serve you WELL.
Enjoy.
Hold into the wind
VarmintGuy