That's actually pretty crazy that you could then sue if you change your mind, seems like the sort of thing that if you decide to go through it then you're done.
I got a vasectomy at the beginning of the month and needed a referral from a doctor which took about 30 seconds, he literally asked if i wanted children and if i was sure then sent the necessary stuff to the clinic.
I've no idea how easy it would be for a woman to get it done here (england) but for a man its super easy.