I had two. Insertion no problem. I had it put in at a clinic, they can give you an injection to numb cervix. Some cramps after but definitely not as bad as period cramps. Fairly quick, not traumatic. Having it out also easy, doctor pulled the strings and there was a weird pulling feeling but no pain whatsoever and it was out within seconds.
Having it in for a bit was great. No periods, no thinking about contraception. However, progesterone only birth control just doesn't agree with me and I got problems. I ballooned in weight, particularly water retention. I also got a cervical ectropion and the strings irritated it so bad even walking or a bowel movement would result in pain, cramping and bleeding. It also made me anxious and my sex drive took a nose dive.
After having it out, I lost 5kg in water weight almost immediately and another 5kg within a couple months without trying. Suddenly lots of things that made me anxious didn't any more, my eczema disappeared, my acne cleared up, I had a sex drive again! Most of these the doctor would have insisted had nothing to do with the coil, some of what was affected I didn't even notice until I felt the difference after removal.
If it had agreed with me, would have been wonderful though. For many it is. Just don't be put off having it removed if the doctors tell you it isn't causing the side effects you experience.