How can I hide the Tails software on my USB stick ? I have no idea to do so. I use it, but I'm no developper.
If your USB stick is smart enough - yes. Make it a multipartitional one. If you are good with a soldering iron - make it yourself like this and you should add a button(with a pull resistor of course!) to expose or not the "hidden" partition. This button is better be well-concealed, or even implemented as a magnetic stealth switch inside the pendrive case.