Awesome, thanks.!

It's not that difficult playing her, but that's only because I have so much experience with her. At this point, I can do her combo (EQWRQWEQR...) without even thinking about it. I can even do partial combos based on the situation. That just comes with experience. When I first started it was really difficult to get used to her kit. Like for example changing to spider form for the extra move speed between camps. To answer your question though, it is natural to play her.

The hardest matchups for elise are lux, morgana and LeBlanc. All of these matchups require predictions. For lux, if she snares you, she can one shot you. All you have to do is Rappel and avoid her snare, then land on her and eat her. For LeBlanc, if she gets on top of you, she will destroy you, and she also likes camping in the shadows. You have to be able to predict her dash and stun her before she can get her combo off. For morgana, she has the spell shield and her ult follows you into the air when you rappel. If she ults you, you have to burst her and kill her before rappeling and escaping, you also have to switch up your combo to get rid of her magic shield before stunning. To do this, you bait out her shield by Q-ing first, the animation is similar to the stun animation so they will think I am trying to stun, then you can do the combo normally once the shield is gone. Basically it depends on the matchup and the champions you are playing against. There is always counter play to a certain extent.

For the third question I have a couple pieces of advice. Don't use this build, for one. There are a lot of generic builds out there that would work better for new players, such as tankier items and runes, and more focused on burst damage instead of sustain and objective dominance. While you're learning the champion, I suggest using one of those builds. Second, the best piece of advice I could give any new player is to learn how her spiderlings act in certain situations. For example, if you stand still, they will not attack jungle camps, but they will automatically target minions. You can use this to freeze lanes. They also stay at your most recent target for two or three more attacks. If you have five spiderlings, that's an additional 200 to 300 damage. Therefore, if you are low health, just run away while your spiderlings finish off your target.

The only real way you can master her kit is to start playing her. You will lose a lot, but the reward is amazing.

Let me know if you have any other questions.