When choosing trees, it’s important to select varieties whose aftercare requirements fit comfortably within your realm of ability and ambition.
For example, pleached trees give a sophisticated effect, but usually require further formative pruning to mature to full potential, and then regular pruning thereafter to maintain the effect, and though most fruit trees will reliably produce fruit, a pest-free harvest is unrealistic without giving due consideration to pest control.
There are plenty of low maintenance options, of course. The important thing to remember is that every tree will require at least some degree of aftercare, even if that’s just regular watering until it’s fully established.
Below are some links which will help you get a handle on the post-planting input you may need to provide.