Sorry, don't try. Many will go through 2-month seo training and will say I am a seo freelancer/sseo expert in Chennai. They are not a real SEO expert. They are as SEO actors. They can only bring you the rank or results.
- Check proper experience in the SEO field.
- Check proper experience in social media activities.
- Check the old website ranks taken by him.
- Ask sample website reposts what they did before.
- Check if there are any proven SEO results in your Chennai locations.
They discuss the budget and close it. My overall suggestions are to find a good, experienced candidate and not go with freshers or low-cost people. Low-cost people can only act and cannot bring the results.