Trig was not one of the more fascinating math courses I've taken, but it was not especially difficult either. Because I'm mildly dyslexic, it was hard for me to remember the half-angle formulas, because two of them are very similar. However I could always derive them quickly when the need arose.
Trig identity problems were mainly hard work. I was never sure what to do first. I just reached into the 'trig toolbox', and grabbed something that could legitimately apply. If that led up a blind alley, I'd start over.
Trig identity problems can be a bugbear for some people, who feel obligated to imitate the teacher, rather than doing the hard thinking for themselves. Here's a little-known secret: the teacher muddles his way through trig identity problems too!
The hard truth: You're mostly on your own. However you'll become more proficient and faster with lots of practice. And that means keeping current on your homework!