Your first step should be figuring out what kind of hanging you're okay with.
itll take around 4 minutes.
It's because your body needs oxygen. So, if you can't breathe, after 1 minute your blood has made it back to the lungs, but there's way less oxygen to absorb.
You'll begin to convulse.
All of the cells in your body will panic as they know this can kill them.
TIme will seem to slow down, as your body goes through some of the most intense feelings it's ever had.
After your body is panicked, it starts to die. Your body will break down in stages, first your limbs, then your skin, then your organs, and last your heart and brain. At around 3 minutes or so, you'll begin to get brain damage, which, if you get out of this, you will probably never recover from.
Then you pass out, and it's over.
As for where...maybe a tree? If you have methods of securely tying the rope up there. (Remember slipknot over hangmans tie...)
If you want to avoid most of the pain, your best bet is to break your neck with the fall. Have a length to jump.