Hi Sandra
Gaining your new Beardies trust is important but since you have just recently re-homed Him/Her I would slow down on the handling to once per day
I agree with the idea of a fecal check and I think that along with that-leaving the little one to settle in for a few weeks will help him/her settle down
As was said-diet makes a big difference in their stools but you do want to rule out parasites especially if he was kept in with other Beardies at the pet store
Little ones are just more nervous in general because of their small size and viewing everything larger than they are as a potential predator
Good Luck with your new Beardie
Sandy