Panic and anxiety, then frustration after my noose broke and other times I pulled out too soon. I haven't lost consciousness so I don't have experience to say completely. It was painful for me though and it's hard to work up the courage to let yourself go completely in full suspension. My last attempt (last week I think it was) I was on my second try and I guess my noose was too tight before I stepped off because I started choking and coughing violently and it felt like I was trying to cough up my lungs, I had pain in my left side, I'm not sure what that was from, and ended up thrashing a bit in panic and hurt my arm. The time when my noose broke it was so tight around my neck it was hard to get off and my throat was really sore and my neck hurt.
Again I haven't gone unconscious though in my attempts and I'm sure that would have helped, but mentally and physically it wasn't a good experience, SI hits hard. Or at least for me. I was just done with everything before I attempted, I had time alone and I couldn't stand the thought of living another day, and my anxiety was unbearable. Immediately my only regret was breaking a nice noose and pulling out early - so basically not succeeding. Having lived I know I'd have other regrets - namely I hadn't actually named a beneficiary on one of my bank accounts (whoops).
To me it's a painful method. Perhaps I didn't do things right, and unfortunately I wasn't lucky enough to go unconscious (or die) from hanging. Also depending on your setup it can be easy to back out of. That's just my experience. Best wishes whatever you decide to do.