I flustered the tech by complimenting her on her technique

Interesting. I think pretty much every time I've complimented someone on their ability to draw blood with minimal pain they've been pleased but modestly waved it away, e.g. "Well, I get a lot of practice.".

I generally haven't been impressed by people sticking IVs in me. For my appendectomy back in 1980, they tried three times, and afterward, the scars lasted for decades. Hell, I think I still see one *today*.