And it´s not like handling them is going to be harmful to you. Their toxins need to be in contact with blood or mucose to have an effect, so as long as you don´t have any cuts or rub your eyes or mouth, it´s safe. I heard some people with very sensitive skins can have a minor reaction but i ignore the truth of it. I have handled fire salamanders exuding toxins in large amounts and nothing happened whatsoever.
As for the animals, if you handle them very very gently and with wet hands, it shouldn´t be a problem. Rough handling should be avoided as their skins are very unprotected.
Oh, and since you raised the issue of adequate sterilization, Kaysie, i think it´s a good opportunity to remind people that if they use rubber boots or something of the like, those are perhaps the main thing to be careful with.