high maintenance is relative.
Fertilize a few times per year and prune them once a year and you'll be alright.
Just make sure to plant varieties that are suitable for the region. don't buy fruit trees from the big box stores. Get them from the local nurseries that will provide you with the best varieties for the region and can give you useful information (Maas nursery, the Arbor gate, Shades of Texas, etc..) Unlike lowes that might sell you a plum tree that requires 900 chill hours, or a hass avacado that will likely never produce fruit. and the employees have no information about how to take care of it.
A good resource for fruit trees in Houston area: http://urbanharvest.org/fruits
Also January is fruit tree sale season. many of the local extension agencies will be having their fruit tree sales.