If I look at reviews of snaggletooth correction, is there really a big difference?

I'm looking up reviews for snaggletooth correction, but I'm confused because the results vary so much from case to case.

My snaggletooth is quite visible, so I'm worried about whether extraction might be necessary. ㅠㅠ

I've seen a lot of comments about pain in the reviews; is it very difficult in the beginning?

Is it okay to ask to see before and after photos of snaggletooth correction when I get a consultation?

For those who have gone through this, what did you look at most carefully when choosing a clinic?