Too scared to try doing ranked matches

For the most part is I'm scared I'll be locked into one and be unable to escape it. I've been playing fairy well lately when I'm wining I've got a pretty high score and even when I'm losing I don't feed I just play safe and get my cs up and poke a bit. But my main concern is I'll just be trapped and have to deal with people who claim to have lag or are toxic. I just would like to no what's the safest way to play a ranked solo queue in case your wondering I'm not in any leagues
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