How do you play adc with the orb walk thing?

I've read that if you wanna be good with adc, you need to learn that orb walking thing. Which is to attack move... something... something... I did watch a video guide about it. But I find is so terribly hard. Because apparently you cannot just 'click' on the enemy champion as usual, but have to use another key to do the attack move. And it is so confusing. I don't think I would be able to play if i have to click on an additional key each time I auto attack. (if that is how it is to be done) Is it possible to do this kiting, attack move without pressing an extra key? xd Can someone who knows how to do it give some advice?

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