what is the best/easiest way to transfer a farcaster account to another custody address? is there a doc or tool for this?

The best way to transfer a farcaster account to another custody address is to reach out to your current custodian and request a transfer form. They usually have a specific document for this purpose. Fill out the form, provide the new custody address, and submit it back to your custodian. They will take care of the rest. It's a pretty straightforward process, so don't stress about it too much. Just make sure to follow the instructions carefully to avoid any delays.