To find a person who can repair appliances, including ovens, ask the people you trust for referrals, as they can provide a lot of information about different handymen with whom they have worked. Make sure that the handyman you choose has all the proper licenses and insurance. Always check if the license number is valid and if the insurance is current.
Choose a handyman who has been in business in your area for a long time, as such people usually have all the necessary experience. Check if the handyman has listings in large Internet directories for this type of service.
Before hiring a person to repair an oven, talk to the professional directly, describe the problem you have and make sure that he knows how to deal with the issue and that he has an idea as to what may have caused the issue. Ask how much experience the person has in dealing with the particular problem. If you ask the person a very specific question and he can answer it directly, this indicates his level of expertise on the matter. Remember that you have an option of hiring a repair company or simply a freelance handyman who works alone.