There are three main reasons why making your immigration application yourself could be the best choice for you.
First, it is extremely important that you provide the Home Office with as much information about your personal circumstances as possible, and clearly no one knows your personal circumstances better than you. Even after telling your solicitor all about your case, they could still be unlikely to give a full and detailed account of your immigration history as well as you would. The more information you provide about your personal circumstances, the easier it will be for the Home Office to make the right decision about your case.