I'm going to offer a differing opinion here and encourage you to go with it.
Provided someone is available to check up at roughly a weekly interval you can succeed, especially if you have tank maintenance experience and have kept more temperamental species in the past.
ATO and a controller are blessed things. If you're willing to invest in a good controller that will do most of the work for you, then you should have no problems leaving for a week plus at a time, especially if it can email you and let you know if anything did go wrong. A nice big freshwater topup tank and a decent auto dosing system, and all you have to worry about is feeding the fish. There are auto feeders for that but I'm leery about those.
I'm sure if you do some research into what equipment would be required than you could have a successful tank. The biggest problem is when you get home you have to do water changes and cleaning as opposed to sitting and enjoying your fish.
