Hire someone who knows what they are doing and has experience within your industry and niche. If that person can show you their best work, they should be able to charge more for their time since they can be more efficient and produce better results. Don't overpay for unproven designers by checking their portfolio, asking about their experience, and getting a feel for how well they communicate with you. A professional designer can charge $150 per hour or more depending on their work type.