I worked with a guy that had to go in three times but I think he was no following post operation care. You are supposed to abstain for a few days while it heals.

When I got my vasectomy it was no needle, no scalpel. They make a small hole then pull the vas deferens out cut and tie it to itself then do the other, all with pain numbing spray. Was 5 minutes not including the ball shaving. I went in to work that night, with an ice pack on my balls all night but barely had any issues. Some extra swelling happened but I went back for an injection of anti inflammatory and it went away.

Vasectomies rarely fail, just make sure to follow the instructions and use other contraceptives until you get the tests cleared (since you will still release sperm even afterwards for a while). Hope you have a smooth experience like mine.