There are many mistakes that you can make in estate planning. Planning your estate is not a basic or simple thing to do.
Numerous people wait to make an estate plan up until they are no longer capable of getting into the right frame of mind. They wait up until they are on their death beds.
Almost inevitably, people who make Wills while on their death beds make huge mistakes. These Wills get thrown out by Courts all the time.
You do not have to make that error.