Tomatoes aren't all that difficult--you just have to pay attention to them. We remove the lower two sets of leaves before transplanting sets into the garden. That allows planting deeper, which in Texas means there is a better chance of the plant getting more roots and more water.
We also mulch, a lot! That keeps the soil moisture more even, and the soil cooler in our hot summer. Tomatoes don't like to get dry, then drenched. The fruit will crack more easily with uneven watering.
Determinate tomatoes set fruit pretty much all at once, which makes them ideal for canning and freezing. Indeterminates put out fruit over a longer period of time, but not when it is too hot. We plant a semi-determinate variety called Celebrity, and get both a spring and fall crop. After the spring flush, we cut the plants back by 1/2 to 2/3, and just keep them watered and alive.
Tomatoes are also self-pollinating, so if you have a breeze, the pollen will distribute itself. If not, then give the plant a good shake.
If you fertilize, don't overdo the nitrogen. You want fruit, not 8' tall plants!