Scaling question

I’m trying to select a bunch of edges that are vaguely on centerline and scale them to the X plane. It seems easy enough, but after 6 hours of trying, I give up. Can anyone please tell me what I’m doing wrong? Thanks in advance

It’s because your center of transformations is the medium point of you selection if you want to scale having the 3d cursor as your reference you need to select it here: image

I’m so happy. Thank you for your help.

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You are welcome.