My aunt's best friend, who has event coordinating experience and lives in the town where I am getting married, is going to be my day-of coordinator for my wedding. Since my aunt has approached her about doing it, the interaction was very casual. How do I breach the subject about either (1) what she charges or (2) what I should pay her? I don't think she does this for a career, so I'm not sure if she has a set rate. If she doesn't, what is an acceptable amount to pay her?