If you prepare your own Will, there could be complications. It’s quite fraught with danger because there is language that you may use that could misinterpret your intentions that could accidentally be included. If the Will itself isn’t executed correctly, it could actually be completely invalid, or it could result in a partial intestacy.
Solicitors belong to a regulated profession and have insurance to cover any possible mistakes that might happen, whereas non-solicitor Will writers are unregulated and sometimes unqualified too. Solicitors are also able to use their specialist expertise and knowledge not only of the law of Wills but also the laws of property and trusts and tax.