I was advised to make an appointment when I got my period but when I called on the monday they were too busy and told me to come down the following monday (period had stopped by then)
It was pretty uncomfortable, even painful for a moment or two, but its over with in minutes.
Cramps were pretty bad and even worse the next day, I just took nurofen and had my hot water bottle to hand.
By day 4 they had completely gone though Ive been bleeding/spotting ever since I had it done 4 weeks ago though Ive been told everything should settle within 3 months. I hope so, Im sick of chucking underwear away!
I am 21 and have no kids either so dont worry about that aspect of it.
Its great not having to remember to take a pill every day