Yeah I also tried using a pull up bar and small stool with full suspension, that was the closest i got and actually almost didnt get out of it, I tied two belts (one to hold the other)and then kicked the stool out, but it was far from peaceful and i struggled out of it.
Do you want to talk about stuff? what is causing you to want to ctb? I hope you find a way to go peacefully and painlessly if that is what you want x