Hi I got a female Spider Yellowbelly ball python and I would want to know some trust gaining tips and handling tips

My ball python is pretty jumpy (for example if he bumps his head against my hand he jumps back)
and I have times when handling she goes ape sh*t and just goes full speed at a point that even I can't catch up she's my first ball python and I had him for 2 weeks (yes I left her alone for a few days when I first got her)
His viv is kinda ok but tomorrow I'm going to town and getting more stuff for it to make it feel like home
Oddly as it sounds she loves going around my neck and it's her chill place when I handle her (doesn't skirmish everywhere)
On my neck, she goes round and round and sometimes tongue flicks my face but then she taps her head against my face (no force from me) she jumps back
I don't know if it's ok to have her around my neck because it's a mixed opinion but it does seem she is really relaxed there
She does go tight on my neck but thats because she is moving around I dont believe she is constricting me as first she would be hissing and biting me (she never bit me and once hissed at me (around a week ago))