ligature strangulation? simple, only needs a thin string (width of finger) and learning like.. two knots?? (square knot & half knot). easy with practice, but takes time to learn the right spots. I almost have it down, I've only been practicing for a night. I've heard it doesn't work for some, but there's 4 people on the site that've passed on through the method.
you could also try SN- you will need to wait for shipping, but almost painless. costs a bit depending on your source, otherwise fairly convenient (can look like an accident too!).
full suspension hanging can be done using the dumbbell/door method (as long as you aren't too tall). same method can be performed as partial, and if you have a metal closet bar- even better. any fabric works as long as it isn't too short & isn't stretchy. I tried partial but couldn't follow through because my material wasn't strong enough.. and the material compressed my tongue to the back of my throat (which isn't as bad w/ lig strangulation imo).
just depends on your materials. wishing you the best, whatever it means for you. I understand the struggle of not having any proper methods that actually work, I've practically been searching my whole life to no avail. ligature strangulation is the closest I've ever got (I'm biased if you can't tell lmao).