All of us are different... I'm a bit more mechanically inclined, so I see the compression/tourniquet/"night-night" method as "simplicity itself" (straightforward and easy)... particularly with a
hookless ratchet (link for pic of one at bottom). For me, all the protocols & procurement with SN seem much more challenging than this. Also, compression/tourniquet/"night-night" has to be among the cheapest, reliable method. But, again, each of us is unique...
Without more details, it's difficult to analyze why there were problems. If you never "felt dizzy" (and therefore obviously never passed-out),
something fundamental was not right (so, although it was your intention to be "by the book"... probably wasn't).
What do you think went wrong?
One is compressing the arteries & veins (not the windpipe), so it needs to be high on the neck (above the "Adams Apple" area). Best to be done quite rapidly to prevent a "swollen feeling" (as veins compress more easily than arteries). Need to be situated so tourniquet can't unwind. Correct tourniquet material, length, width, and "give" (stretchiness) must be used. Knot must be done correctly to not "give". Keep cranking until pass out.
The
hookless ratchet tie-down compression method is my personal backup method. It's a tourniquet, but I feel it's more secure (because there's no way it can unwind). A
hookless ratchet resolves all issues with material and no knot required: Ratchets -- by design -- are secure and don't "give" ~at all. In my careful, brief "testing", the feeling of the strap/tourniquet on my neck gave only minor discomfort. They're available at many retailers. Got one in a drawer 10 feet from me right now. Total cost ~$10.
I wrote a slightly more detailed post here with a pic of one, see...
https://sanctioned-suicide.net/threads/self-strangulation.45267/post-821012
Edit: I had said, "The only thing one needs to do to prep the ratchet is to carefully consider the length of strap needed and to cut off the excess (cut off too much and it's ruined)."
But @Xali1970 had corrected me in pointing-out this was unnecessary. I double-checked and @Xali1970 is correct. Learn something new every day!