I’ll break this up into steps for you to ease the nerves:
See if you can get all your E*trade shares to fidelity. It’s just easiest to DRS from Fidelity. Fidelity will help you transfer your shares.
Get on the chat with fidelity and tell them you want to DRS your shares. They will initiate the transfer. Then you wait for a few days. This is the hardest part.
In about a week, you go to CS’s register now page and start your account.
DM if you have questions along the way. I’ve helped other apes get their shares over to CS. I’ll walk you through it too if you get stuck in the process.