Common mistakes include using someone who is not properly regulated, missing deadlines, giving incomplete or inconsistent information, and relying on outdated online advice. Applicants may also fail to check exactly which documents are required, overlook translation or formatting rules, or assume a solicitor can guarantee a visa outcome. Choose a solicitor regulated by the SRA or another appropriate UK legal regulator, and ask who will handle your case, what it will cost, and what is included. Check the latest guidance on GOV.UK and seek advice promptly if your situation is urgent or complex.