Look for a solicitor or immigration adviser with experience in your specific application, and ask for a written breakdown of their services, timescales and fees. Check that a solicitor is regulated by the Solicitors Regulation Authority (SRA), or that an adviser is authorised by the Immigration Advice Authority (IAA). You can also compare their reviews and ask whether they will handle your case personally. Immigration decisions depend on your circumstances and the evidence provided, so check the latest requirements on GOV.UK and seek advice from a regulated professional where needed.