This question is similar to How can I aim better/kill people more often in first person shooters?; but instead of first person shooters, I'm playing Smite.
I find that when trying to aim skills that require skill shots, I tend to miss quite often, especially in the heat of battle. Cone shaped skills are much easier, but the line shaped skills always give me trouble.
Does getting better at aiming just come with practice, or is there something I can do to improve my aim?
Honestly, the only way to get good at landing skillshots on enemy players is by practicing landing skillshots on enemy players.
The best way to do this is arena. You'll get good at skillshots and teamfights quickly.
That being said, since you're somewhat new, I recommend just playing Conquest (or Siege) and letting the learning and muscle memory come on its own. Arena is great for getting good at the combat quickly, but it will build bad habits for laning game-types.
Trust me from experience: those bad habits are very difficult to unlearn.
Play more FPS as aytimothy have advised.
Why?
Because every bullet you fire in a FPS is equivalent to said skill shot that you are having difficulty. An FPS will be an ultra concentrated version of TPS MOBA skill shots that you need to get better at.
