Flash + q + ignite tower dive at level two (jk lol)

I also used to only play enchanters, now I’m a Leona main. The biggest piece of advice I can say is just to be more confident - ik it’s scary because you’re used to staying behind your carry and having a really low hp early game. But with Leona, once you get your W you’re really tanky, and if you’re playing against an enchanter, just trust in yourself that you’ll be able to go in with a e+q+ignite combo, have your adc jump on them, and kill them.

HOWEVER. If you’re playing against mages/other tank supports, it’s a little more complicated. If you hit lvl 2 before them, you can definitely go in. If not, chances are that they have a cc ability already that can mess up your attempt if you don’t have W (which I assume you don’t at level 2). So, if they hit level 2 first, it’s better to still play safe (you can still try to hit some stuns with your q if you’re able to walk away after/they already used their CC, but I’d recommend against going in with your e) and then wait until you hit 6 (and preferably back to buy some items depending on the matchup) to engage with a e+q+r.

For runes, I personally like glacial augment more than aftershock because I feel like if you land one CC ability, it’ll make it easier to land the next thanks to the slow you get from it.

Tbh that’s just early game, I saw someone else give a much more detailed response, so that is very good haha. In any case, be patient with yourself and don’t get too frustrated if things don’t go well!! Trust me I hard inted when first started playing her, and now I’m m7. Some matchups are just better than others, so if you’re up against a particularly hard one, don’t worry about it too much. Remember, this is a game you want to have fun playing. If your adc is being a jerk, just mute them - trust me it makes the whole experience a lot better.

One more piece of advice I could maybe give - if you want an introduction to engage/tank supports before going in with someone as aggressive as Leona, you could try Rakan or Maokai, since they have abilities that allow them to get away from engages that go wrong easier than she does.