Just want to add a few things from my experience. Some beardies will deal with relocation better than others, so some of the aggression could be in part to the new surroundings. Also I have seen that some will bond with those they are used to but new people can be scary at first.
In the end as mentioned it just takes some working with them. Starting just by having your hands near them, you want to see them paying attention and really thinking not just reacting. Fear causes them to react instinctively, but when they stop slow down watch what your doing without fear but interest is when they start learning you aren't a threat. Over time you will get closer and closer without a bad reaction until you are able to handle them and they enjoy it.