Uhm, give it a shot. Yes, it is stressful, yes, it is ungrateful, but the +12 elo screen at the end? Man, isn't that rewarding...
Master a champ. Like, win every freakin matchup possible with him. Optmize your runes, masteries. Get good at every role, but dedicate a little bit more to your favourite role. Learn counter picks, spawn timers, teamfight approaches. When people are going to ask for advice from you, you might feel ready. The thing about trying ranked right after lv30, is that once you elo drop hard, it's really hard to get out. Elo Hell is like Meth: not even once.