Even if you sign a power of attorney, you can still manage your own affairs. You are not giving up anything. Instead, you are taking steps today so that your agent will be able to act when and how you have directed, if or when it becomes necessary.
Can I Cancel a Power of Attorney After I Sign It?
Yes. You can cancel, or revoke, a power of attorney at any time by tearing it up, by signing a new one, or by writing that you want to cancel it. You don't have to give any reason. If you do cancel, it's important to let your agent and anyone your agent has been dealing with know that you have canceled the agent's authority.
If I Give a Power of Attorney to Another, Do I Give Up the Right to Manage My Own Affairs?
No. As long as you remain legally competent, you retain full control over your affairs. Think of your agent under your durable power of attorney as an understudy waiting in the wings to help you. You don't hand over top billing until you want your agent to perform. You can change your mind.