If you are not sure that you will do everything right, you should not do it yourself. If I were you, I would contact
https://www.salvagedata.comdata recovery
and tell them what requirements you have for their work in this case. I am sure that the specialists from the service center will do the designated work better than if you try to do it yourself. If you want to do everything yourself, you should first write down all the account credentials, logins, passwords, and other credentials to avoid later losing this information.