We all should know the obvious things. I like to give the surprise discount at the end and asking them to give a review. The ask might be the most important outside of good service. The surprise discount is just icing the cake. Example- if you charge $100 an hour and a job takes 1:40 minutes. Tell them you normally bill by the ¼ hour (assuming you do, I do) charge them 1:30 and they will appreciate it and be more apt to actually take the time to do a review. Feeling like you gave them extra time and it's justified to give a little back.
