how bad can a fully grown adult bp hurt you with a bite ?i mean can it rip your skin off ???
It won't hurt that much and they definitely can't rip your skin, at the worst they will cause small puncture wounds. I think it would sort of itch more than hurt.
if they draw blood, wont that cuase them to bite more often ???
No. Snakes are only interested in the blood of their prey. If you get bitten it is out of fear or a feeding accident, they will not bite you because they want to eat you, but if you smell like a mouse/rat due to touching a mouse or rat without washing your hands it is possible.
Can a bp know that that's the owner grabbing her/him, and not bite ???
Sort of. It will get used to your scent and distinguish you as neither a predator or a prey item. Snakes, as I said, will only bite out of fear or if you smell like food. My ball python is a little bit nervous before I run my finger down my back because he is used to me doing that and a lot of other owners do something similar because it helps the snake recognize it is you.
i mean i know they can't be tamed like dogs or cats, but how much can your bp be trusted ???
You can't put trust in anything with a mouth really, if it has a mouth it can and will bite if it has to. I think Ball pythons can be trusted even more than dogs and cats because they bite only out of fear and if you smell like food, whereas dogs and cats will bite out of fear, anger and if you smell like food.
From your post I can tell that you know very little about snakes and you have taken a step in the right direction by finding out more. Read all that you can about the specie you want to keep and you'll probably be very happy and sucessful. I love ball pythons and I think that, as long as they are captive bred, they make a great first snake!