Suggiefan hey! sounds
like you are doing great. Three weeks in and they are sitting on your shoulders...
...and tolerating ANY contact with your hands is great at this point.
There's a lot of different kinds of bites. These little guys explore the world with their teeth.
...and those giant eyes can't seem to see what's right under their nose--so I figure they sometimes bite, just to see what something is, or what it's made of.
Karen, above, laid out the methods.
Do a search here on biting...loads of good info.
At this point, I don't think mine will ever get to a point where they never touch me with their teeth. They just instinctively use their teeth so much.
But with patience and consistency you can get it down to nearly nothing.
Good luck and welcome to the addiction. :-)