I had no idea how to play Black Mage and still don't have much, always leveled the job at 70 and sleep on it, not touched in 2 years and all I could remember was the Flare spam for aoe.
It's a very difficult job to learn at first but once you get the grip, it's very satisfying to play and feels natural. For sure it's not as easy or simple as the Red Mage.
You only need to grab the logic of "Fire" and "Ice" phases, once it's done, there's no difficulty anymore

Don't be afraid to try it, if you level it from the start to 80 I'm sure you'll grab the mechanics very fast!