Yes, I've had it done, the actual injection was only slightly painful, no more or less than any other injection, it was slightly sore immediately afterwards, no worse than the pain of plantar fasciitis. I took it easy for the rest of the day, but after that I was fine and able to carry on as usual, can't remember whether the improvement was gradual or immediate, but it did work and two years on am still pain free. I will be honest and mention that the needle used seemed to me to be massive, but then considering the thick skin on the heel, I suppose it would need to be, my GP did mine and he gave me no warning that he was about to stick me :) but other than a slight flinch, it really wasn't that bad. Hope it works for you, it really has improved my life, I was supposed to get the other heel done a fortnight later, but the improvement in the one done helped my walking so much I didn't need to get the second one done.