- Asking for references or previous work examples can give you insight into the quality of their work and customer satisfaction. 4. **How do you typically charge for your services — by the hour or per project — and do you provide written estimates?

- Asking for references or previous work examples can give you insight into the quality of their work and customer satisfaction. 4. **How do you typically charge for your services — by the hour or per project — and do you provide written estimates?