I wanted to reply tomorrow, because I'm low on energy, but since the thread is fresh and I'm on the writing streak, I think any reply will do. I've done partial too many times already with many anchor points and ligatures, typed what I remember most. Some experiences are old, so I hadn't know how to actually do it properly
1. Silicone jumprope with tree
Tried with both half-standing and kneeling, but since jumprope was only about 6-8mm thick, it was really hard to pass out. I tried with two trees for few minutes, but since ligature was shit, it was no point.
No physical signs, just disappointed and redness on neck that faded in few minutes.
2. Material belt with tree
It was wider, but not thick and hard enough to be stable. Firstly, I choked and exhaled loudly when kneeling (one kneel lasted 1-2 minutes, but no passing out). Only one time I felt light fainting with hard pain on the neck. Then, with harder drop (it was partial-full?? kind of thing; fallen tree that was both support and anchor point), I felt like passing out, everything went blurry, but the belt ripped in 3-5 seconds, so I had no choice and returned home.
I had slight mark on the neck; it looked like red string with few red-purpure dots. It was visible for 3? days. I felt disoriented and not present mentally, apparently looked like that in pov of the parents too. Next day I managed to smile and hide the mark, but felt the same.
[ I firmly believe that my soul has actually died that day and is still hanging invisibly in that spot ]
3. Material belt and leather belt with doorknob.
It was another one, just different material, with similar width, about 2,4cm? The leather one was the same width, but it was more sturdy.
But no matter the ligature, doing partial with doorknob was hard, because it was too low, so I had to almost kneel-lie in terms of proper pressure on arteries; because of uncomfortable position, it was hard to stay in it, especially with hard and less-strechy leather belt.
Redness on the neck faded in an hour, felt mental exhaustion like I've just run short marathon. Body was in pain for few moments.
4. Shelf bar with material belt, leather belt, scarf.
Shelf bar, on the other hand, almost worked with every ligature! The most successful was with leather belt without any self-tightening knot; 3 times I almost passed out after 10 seconds (pressure in the right place, no "blocked head" feeling, no suffocation), but when loosing consciousness and blacking vision, my BODY stood up AUTOMATICALLY every time.
The common experience though was that the fainting was very slow (30 seconds max). It was trial and error - sometimes it lead to suffocating feeling, sometimes it was done in "sweet spot", sometimes it was simply friction on skin that didn't do much. Often my body's survival instinct came in, it felt that something's not right is happening to the body, so I retreated because it was taking too long (once it was 1 minute and no shit)
Usually, after trying for long time, there was a red mark around my neck, half of the width of the used ligature. It lasted 2-4 days, depending on how hard I've tried. Sometimes a puffy face, but not very red and swollen. A light feeling after successful pressure, but felt "more stupid" afterwards.
I have also experience with partial that was supposed to lead to full, you can
read it here. The words are jumbling in front of my vision rn so sorry if something is incomprehensible

(Still, I really can't write anything short huh)