We are the captain of our affairs and know how to operate them and keep our ship on course. If you expect everything to continue working when you no longer can, you better have someone trained and qualified in the intricacies of your affairs, ready and able to step in. This does not mean someone with their name on a piece of paper in a bank vault who has no idea about how your ship floats.
One of the most effective tools to accomplish this is a Revocable Living Trust, an estate planning tool in use for many, many years. A lot of us are not aware of it as it is usually used for larger, more valuable estates. A very simple illustration is that it is like setting-up a corporation, of which you have full control that will own your assets. Since it is also very effective before you die if you become incapacitated, it is a shame it is not used more often as it can greatly simplify the process of having someone take over.
There is a lot of information in circulation about Revocable Living Trusts being great estate and financial planning tools. Some of the information is accurate, some is unreliable, and some is just plain wrong. So I would like to start with saying that the advice and counsel of a well qualified attorney is required to assure your desires are met, that no harm is caused, and that all other needed documents, such Living Wills and Power of Attorneys, and Pour-Over Wills are also provided.
After you have all of the proper documents you must also take all required steps to make it operational in the real world, which is referred to as "funding the trust". A bad document or a good one improperly put into effect or no legal plan at all can turn into a nightmare. One version of that nightmare is guardianship or appointment of a conservator, with the court making the decisions about you and your affairs.
From the point of view of a caregiver, I see the greatest value of a trust as providing the tools to operate the affairs of an incapacitated person in a way that is both effective and requires only a reasonable amount of effort. If someone needs to start their duties as trustee or as attorney-in-fact from scratch in the midst of the often accompanying health and emotional crisis, they may very well become overwhelmed and ineffective. For your well being and to minimize the intrusion you will cause if you should become incapacitated, you should involve your trustee in your affairs now even though there may be no present need. Including them in the process of making a trust operational is an excellent place to begin. Show them where things are kept, introduce them to the medical, financial and legal professionals you work with, and help them to comply with all the administrative requirements that banks, brokerages, insurance companies, etc. will demand.
In short, get those who will be taking over from you onto the bridge of your ship and show them how to navigate. For more general information on trusts see here.