I don't use eyeliner. It's so hard to put on! I never get it right :(
try youtube videos....they're awesome. You can see demonstrations.
Also, people have different ways of applying eyeliner. Some close their eyes and trace the liner against the outline of their eyelid.
Some people close their eye and stretch their eyelid from the outer corner and apply eyeliner.
And some are like me.........they apply eyeliner while the eye is open. I keep my eye open and apply a thin layer of eyeliner against the open outline of my eyelid. But then again, Alhumdolillah, I have a steady hand, lol.
One tip that helps is to set your elbow on a firm and raised surface. Setting your elbow down helps your hand to become more steady so it shakes less. It takes practice. I was horrible with eyeliner in the beginning.....with practice...i got it right ;) Gotta start somewhere!