rushing the uros will only make it harder to get them acclimated and used to handling. If I recall, you've only had them for a couple days now, right? I would wait a couple more days before I would start hand feeding them, and letting them basically see that I'm not a threat (mine likes to lick my fingers when I take her out, just to make sure it's me). Think of it this way. First of all, new reptiles accimating is always going to take at least a week or so. Add to the mix that they're wild caught and it makes it harder. They've most likely gone from their homes in the wild, to hours upon hours of transporting, to a temporary home (I'm assuming), and then more transporting, and finally to you. Imagine being a little uro that knows nothing of the world besides what they need to know to survive and reproduce, and then imagine going through all of that trouble. They are in a new situation and you need to let them get used to it. Hand feeding is a good idea though because it will help them get used to you better, but you shouldn't expect to have success on your first attempt.
In my opinion, wild caught animals have had rough lives. They were taken from their homes in the wild to smaller homes where they are basically controlled by you as opposed to being controlled by natural events (weather, etc.). That's why I think it would be absolutely great if we can get breeding projects setup (many of them) so we can start to have a better captive bred population. It would be cool to have CB uromastyx as available as CB bearded dragons (though bearded dragons are only available captive bred outside of australia, due to the export laws). Just some opinions. I just think this sort of ties in with the acclimation period, though every animal, whether CB or WC is going to be a little different about acclimating.
Good luck with your new uros.