I am lucky in that I have a fishkeeper across the street.
They are gone on a lot of weekends so for a couple of years my daughter has cared for her fish when they are away. I know that if I ever need it, I have someone with experience who would be happy to help me out.
One caution on the ATO. I have read numerous threads from people who have been doing this for a very long time. ATOs have a tendancy to malfunction and cause floods. I am not saying don't go that route but just be very careful which one you go with and how it is set up.