here his how I have seen bonding process go from my experience.
1. glider crabs and lunges, bites the heck out of you.
use bonding pouch a hour or so a day, feed a few treats, get going into your glider safe room/bathroom/tent, let them explore, don't get in their face. use body scented fleece trick, many other tricks.
2. glider crabs maybe lunges probably not, will bite if you try to pick them up, but bites are smaller or because they think your finger is food, or they are marking you while walking on you.
if they will stay in sleeping pouch, then I skip the bonding pouch and sit the sleeping pouch on my lap, pet their head, let them crab, pet their head.
3. glider crabs some but less, will not lunge, starts to take treats slower (not the fast grab and run) if you try to pick up will give you medium nip while running away.
at this point my wife will stick glider with other bonded glider in bra, let them take a nap.
4. glider stops crabbing. they will walk on you, won't bite unless they smell food on your finger, but usually wont bite and know finger from food. (my link will STILL test my finger after live mealworm time, he love them so much he will always test my finger to see if one more is there.)
Our sophie will spend a long time sleeping with me, loves to hang out with us humans, very bonded. but if sleeping in pouch with other gliders she will try to stay away and stay in pouch, once sleeping with me, I have to pry her off me to get her to go back to cage.
the more time they are with you the less scared they will be, the more trusted and bonded they will be. many tricks or methods available, sometimes you need to push the glider (with a cockatiel we were told we would need to wrap in towel hold gently and pet them on head so they would learn we are not going to hurt them, it worked, dang bird would fly right to my shoulder and nibble on my ear all the time.)