Help Id like some advice on my plan

[P1g30n]

I want to ensure that my plan will actually work, I don't want another attempt that I failed. So I am coming here for some advice. I am 5'2" and 125 lbs, I plan on tying a slipknot rope to a pull up bar that is attached to a cement wall a bit above 6 feet up and kicking a stool from under my feet. Is this physically going to work out or will I just suffer until I die? I am willing to put on more weight if necessary for a clean death.

Thank you