It all depends on your pain threshold.
A mate of mine has dozens and nearly everythime he faints. Just take a bottle of water and stay away from the light at the end of the tunnel 😉
I’ve 2 on my upper arms and I’d say they felt like a blunt razor blade (covered in aftershave) slowly dragging through your skin.
I’m thinking of starting on my legs next, report back here your findings tomorrow please