Legally. Even though you’ll need to pay for their services they can ensure that all is well. Then you won’t need worry about it in the future unless you decide to change your plans in the future.
A checklist of assets can assist you to make a list of all the things you will need for your will. Be sure to leave no detail unanswered. There could be conflict between relatives and friends when your death occurs. They’ll have to determine your estate. They won’t determine your needs without your assistance. This should be as specific as you can.