Locksmiths can specialize in certain areas like he could be an expert in automobile locks or he could be a door lock specialist. So do ensure that you call the right person for the need at hand. By and large most locksmiths are skilled in all fields concerned.
Be sure to inquire if the locksmith you have in mind is insured just in case there are some damages. If he has liability insurance then it will in all probability cover any cost of repair or compensations. Of course insured locksmiths may charge you more for their services, but it would definitely be a better bet. One point is that you really have to be cautious about is that a locksmith who does not confirm that you are the rightful owner of the vehicle or house that he is going to unlock, cannot be trusted. A locksmith queens of good standing will first and foremost ask you for your credentials before setting out to unlock doors.
A round the clock locksmith of nowadays does not make locks; he only specializes in picking, repairing and cleaning locks. He is often called in to verify the security system and in the procedure tries picking locks to test the system. He is also called in to renovate old locks such that old codes are substituted by innovative ones. Very frequently locksmiths are called in at any time of the day during mishaps when passengers are fascinated inside locked vehicles. It is often essential to get them out of the vehicle at the earliest for safety measures reasons.