The proxy, remember you get to assign this person, can only make decisions if you cannot speak for yourself and/or are too sick to make them for yourself.
You get to choose how much medical decision making control your proxy has. However, it is important to give your (HCP) health care proxy/(MPOS) medical power of attorney the ability to have some flexibility, because we cannot possibly think of all the different scenarios that "might" happen.
Each state can vary, so its imperative to do some research for the proxy role, so that you have a better understanding and are more comfortable with whom you choose.
Here are some common responsibilities your proxy may be asked to fulfill:
You may change your healthcare proxy at any time. All you need to do is to fill our a new document reflecting this change. However, please make sure loved ones, doctor, and old proxy, are aware of this change.