I get what you mean. I tried it standing/leaning and found it to be uncomfortable and especially problematic once the convulsions begin. I found that securing my tie whilst sitting was the best method.
I tied it such way that I had to prop myself up with one arm while securing the tie to fit into the noose. Once it was secured, I sat again slowly, normally, allowing my body weight to tighten the noose itself. My neck eventually was elongated due there being no slack at all, which allowed for more than sufficient pressure on the arteries to make me dizzy and start to black out in seconds.
I'm pretty limited to what I can tie my ligature to. There is the closet bar, a door knob, and very low bar on my elliptical.
I tried using low bar on the elliptical while laying face down, hoping that the laying position would help. But it's an awkward position, and my room is also the main room for 1 of our pets, and she kept booping me wanting attention so I gave up on that pretty quickly.
I almost had it while kneeling, leaning forward but can't get over the panic that sets in when the fainting feeling comes in the upright position.
If I'm laying down it's more like going to sleep.