It's pretty simple really. One of us just needs to let them know you're moving. Generally, it's nicer if you talk to them first and copy us into your email. We can provide suggested wording if you're not sure what to say. Or if you'd rather not have to talk to them ever again we can take care of everything for you.
Once your old accountant has been notified that you're moving, they will send us copies of all relevant information and transfer your Xero subscription to us. Generally this process takes a couple of weeks, but could be delayed if you owe your old accountant any money or if they are completing work for you.