Ooh...biting? I can speak to this...

IMHO There seem to be different kinds of bites. It will be good for your blood pressure to know the difference between them.
This is an animal that uses it's teeth a lot, and most bites are just little nips or gnaws that you eventually get used to. But the more aggressive bites are signals that we need to change our behavior/husbandry methods.

Exploration Bites: These guys explore the world with their noses...and their teeth. Put a bunch of glassware out on a table and let them walk around. You can hear it, "Tink-tink...tink-tink..." These are little nips to see what you are made of. They don't hurt, but they are alarming. (It's always alarming when a small animal bites me, anyway.)
These seem to diminish as the glider becomes more familiar with you.

Grooming Bites: "OMG Huney!! We haz GOTZ to exfoliate right here!" Usually starts as a gentle gnawing and builds progressively until the animal has chewed your arm off. Sometimes they will get fixated on a spot--like the back of your arm, and keep going back there. Eventually you can train them off this with persistent verbal correction.

Over-Excitement Bites: Sometimes I don't know if those huge eyes can actually see what's in front of their faces. They were going for the treat, and they got your thumb instead.
"Sorry Mom--I missed!"
Really--they don't seem to see well at all, right under their noses. These can be powerful depending on prey drive. They are doing their best here...up to you to stay out of the way of these bites. Some people only feed certain treats with tweezers, for instance. Depending on how frenzied the glider is about the treat in question.

MIS-ID Bites
"Sorry! Sorry! I thought you were food..."
Also helps NOT to smell delicious.
Delicious fruity scented soaps and lotions should be avoided, as well as less popular flavors like:
"Small Slow Lizard"
"Meal Worms and Chamomile"
"Wounded Songbird and Sea Salt"
Patchouli
After you feed treats, like yogies or mealies, you may want to give your fingers a quick wash to get the scent off.
"Hey it's pink and wiggly and it SMELLS like food! What did you think I was gonna do? This is entrapment!"

Fear/Aggression Bites: These are the ones we all want to avoid. Usually fear is the impetus, or they may be "Pouch Protective".
"Hand-Snuggling" in the sleeping pouch with them as they go to sleep, is the best way to cure that. You may need to use the FIST. Or...in extreme cases, Yogurt Fist.

Above all, don't fear the bite. Even the worst bites I have had, I couldn't find where they were the next day. Fear is the enemy. We have a natural, instinctive revulsion to being bitten by small mammals. But they can't do us any permanent harm.
(Unless properly trained and equipped...)

to be honest i have no idea what i am doing. lol...