Sharing this little gem as I'm a complete needle-phobe! Went for my blood test at 12 week scan app. and just as the nurse tightened the strap round my arm she dropped something which left the strap on for 2-3 minutes before the blood test. I didn't feel a thing, literally! Afterwards she said its probably because she left the strap on for longer than usual. So... Yesterday I had to have bloods taken and explained I'm needle phobic but if she could leave the strap for a couple of minutes that really helps me. Once again I didn't feel a thing! It is definitely working for me and I'm not even worried about the next one now.
Hope this helps!