I did my own circumcision too...
The method was the same that Splitglans described, but I made a huge mistake, I cut the skin after the ring in the same day, as that skin was alive yet, my entire penis start to swallow, I really did a mess..
Because of the swelling, the string that I used to titgh the ring, start to came loose and the bottom side slipped off, that part became a open wound. After the first week, all of the area that the string did its job, started to look way better, so I cut the string and remove the ring and that bottom side remains open a lot swallowed.
After 4 weeks doing bandages, doing with all the required wound care, I loose the hopes, all the other sides was almost perfect, but the bottom still open and with no signs of healing, so I went to see an urologist. I choose an expansive one, so maybe him won't make too many questions about it... He was an 50 years old doctor with a lot of graduations (urologist, surgeon..), so I sit into his chair and he ask me what's happening.. Can anyone imagine his reaction of me telling him that I cut my own foreskin at home? Yeah, for some minutes he stand there just staring me with no reaction at all, that moment that I realized the shit that I did.. After the time he took to aceept what I did, he asked to look and I showed to him. After some talking about the details (he had a lot of questions of how I did it), he offered to did some stitches at the open side, the price was cheap, but at that moment I was desperated, so I accept it and he did the appointment to the next day.
After the stitches, everything started to heal properly, but probably because of the time of that wound stayed open, the scar didn't became nice, there's a bump underneath the scar on that side and maybe this will remain forever, maybe will be smoother with some time, but not much better. And the side that the string worked? Became nice, no scar at all, just the skin tone change, very smooth as it suppose to be.
I didnt remove all the skin, it became a very loose circumcision after all. Maybe one day in the future I try that again, but without cutting the live skin this time, I always wanted a tight cut, or maybe I go to a surgeon for a better job, idk..
My final opinion? I regret of doing this, I should did this at the hospital with a professional.. The price that I paid was the same at the end.
The side that became ok:
The bottom side with the stitches scar:
The final result: