Book + trust the expert! Make sure they have the necessary technical skills to complete the job to your satisfaction. This is a non-negotiable. Do not go with someone who would be "learning on the job". Trust me, someone who is an expert in their field will be able to work more efficiently and effectively, as they will have the skills and experience to complete the task to a high standard in a shorter amount of time. Once you feel confident they are the expert, trust them to do their job.