You can make a codicil for an existing will or write a new one. Either way, it must be witnessed in the same way as a will. Choosing an executor and trustee You can choose anyone to be your executor and trustee. It can be a family member, a friend, a lawyer, someone from a trustee company or some other professional. It's usually best to choose two people, in part to reduce the chances of the executor dying before you do.
Some people prefer to nominate relatives or friends.
Such people may be perfectly capable of doing the job, using professional assistance as need be, with the costs coming out of the will. This approach can be far cheaper than getting an expert to do the work. But there are some drawbacks. You may prefer the more expensive option of using professionals. If your relative is unable or unwilling to execute the will, the role passes to the professional.