biz_fish,
Actually, steep turns aren't that difficult. However, flying is indeed an enormous challenge. But I'm quite certain that it's one you can cope with. However, feeling daunted by it is perfectly natural. I deal with that sort of feeling by refusing to look at the whole thing. Just focus on the next step, the next lesson....and maybe just a little way ahead so that you can plan.
When I was struggling to learn to fly, I used to look at students further on in the course who were coming back from solo cross countries with something like awe. I simply couldn't believe I'd ever manage to fly well enough to be able to do that, alone. But of course I did.....and so will you.