Partial can be done nicely if you find your sweet spot, place on neck that compresses arteries nicely wich leads to quick blackout. If you do succeed in that then you just need to find a good anchor point and body position where convulsions wont loosen up your noose. If it loosens you will probably wake up and fail.
Try reading hanging threads, or searching around for personal expiriences. Theres alot of info out there