Look smart, be polite, speak clearly
Wear smart clothes (or apologise for your inability to do so – eg, if it is an emergency application). It is usually acceptable for lay representatives to dress less formally. Use standard English where possible; slang may not be understood and will almost certainly not further your case. Appear as confident as possible without being ‘cocky’. Be respectful and pleasant. Use eye contact and smiles to retain the attention of the sheriff.