Skillshot help

So I want to pick up nidalee seeing how she has been a viable choice for quite some time. I have been playing a bit with her in normals, however whenever I have a smart opponent around my level that knows how to dodge, I can never land a spear on them. Yet when I watch pro junglers use her, they almost never miss. I pick up sweeper fairly early into the game so I can make sure they can't see me comming, but most of them still can avoid the spear so easily.

Are there any secrets or tips that I dont know about? Because I'm pretty amazed at anyone plat+ that can play nidalee well considering I can baraley land a spear.