To make your will legally binding you need to make sure it’s signed alongside two witnesses. It’s important that both witnesses watch you sign your will at the same time, then they need to add their own details and signatures. This is so that, if your will is ever contested in the future, your witnesses can testify that they watched you sign your will. Your witnesses should be people you trust, over the age of 18. They cannot be a beneficiary in your will, or married to one of your beneficiaries.