It sounds to me like your little one is going into puberty a little early. Just like human teenagers, they can become little brats when the hormones are raging. Also, since you've only had him for a short time, he could simply be afraid and feel a bit threatened by all of you. Imagine how you'de feel is someone about a 100 times bigger than you are kept picking you up! He may think you want to have him for lunch! LOL
As the above posters mentioned, just sitting quietly by his tank, and talking to him, while your hand is in his tank will work wonders with him. Put your hand close enough so that he can see it, but not close enough to him that he will feel threatened by it. Once you do this a few times a day, for a few days, it won't take long for him to figure out that you aren't going to hurt him.
Also, if he does lunge at you with an open mouth, be ready for it, and pop a piece of food in there. That usually works every time......he'll start to chew and forget all about biting. Also, it tends to confuse the devil out of them. They're intelligent little guys, and he'll begin to wonder why you're feeding him when he's trying to bite you. If you don't react with fear, as he expects you to, it stops being fun, and the behavior will stop.
One of the best ways to get him over this is to do the "beardie burrito" routine at bedtime. Just before you normally turn out his lights, when he's very sleepy, turn his tank lights out, and dim the lights in the room so that its nearly dark.
Take him out of his tank, and wrap him snugly in a soft hand towel, with just his little head sticking out. Then lay him on your chest, where he can hear your heartbeat. Talk to him softly and rub his little head and back, until he drifts off the sleep. Once he does, keep holding him close for 10 or 15 minutes, and then carefully pick him up and put him back in his tank, towel and all. When morning comes, and he wakes up back in his tank, he'll remember you're holding him, and realize that you didn't hurt him at all, even when he was asleep, and was the most vulnerable. This is absolutely the best way to build trust, and after a few nights, you won't believe the change in him. Once he bonds with you, you'll have a best friend for life, and you won't believe how affectionate he'll become with you.
Just try to remember that he's not acting this way to be mean or nasty, but rather because of fear and feeling threatened. Even when a beardie is extremely scared or angry, they rarely bite, unless they have no choice in order to protect themselves. Most of the time its all a big bluff to get you to leave them alone because they're afraid of you. If you take away the fear, the love and trust follow very quickly, and believe me, it will be worth the effort!