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The question is too general. Depends a lot on the kind of surgery you're doing. I guess the answer you're looking for is that anyone could be a surgeon, but not for all kinds of surgery. Also 'basic plumbing' with no room for error is not an easy thing at all.

It's more in that if you improperly connect a to b someone dies, and it's not just a snap fit like a pipe. You need to do things like suture two blood vessels together, using pliers (not the technical term), inside a dark box lit up by a tube, while looking at an upside down TV image of what's going on.

It doesn’t have to be upside down; you can just rotate the camera to any angle you like.

I'm just relaying what my friend who is studying to become a doctor told me, but by his account there's a wealth of techniques for each procedure or even parts of it, like tying up the dangling bits after kidney removal.

Ultimately it boils down to what a given surgeon practiced in their career.

Most complex or endoscopic surgeries are (dependent on dexterity)