What make up techniques are hard for you?

When I was learning, I had the hardest time with you particular techniques. I could do the crispest, cleanest eyeliners, flawless brows, and a perfect complexion...BUT for the life of me, I could not do precise symmetrical lip liner or blush that worked with a clients natural bone structure. Yes, dedicated practice got me past it, but I'll be totally honest, a precision lip still gives me a shiver now and then.

What are the things that were hard for you? Are there any techniques that still make your heart beat fast?

What did you do/are you doing to make the technique that scares you into one you love?