If you're in the US, and don't already own any shares, you'll need to buy at least one share through Computershare to get an account created. It will take a few days, they're not retail-oriented.
For the rest of it, Fidelity seems to have the best customer service and the shortest time to transfer to CS. You can do both concurrently, so if the squeeze starts before CS completes the transaction, you're covered.
If you're in the US, and don't already own any shares, you'll need to buy at least one share through Computershare to get an account created. It will take a few days, they're not retail-oriented.
For the rest of it, Fidelity seems to have the best customer service and the shortest time to transfer to CS. You can do both concurrently, so if the squeeze starts before CS completes the transaction, you're covered.