Hey learning247, I've been traveling about 4 years now, I'm an ADN with out my BC and started with about 2 years or so experience. There are a lot of travel positions currently available, many of them pay very well. Being a good travel psych nurse mostly depends on the nurse, how well they can handle an intervention or avoid one, how well they treat the patients and what tips and tricks the nurse can offer the facility to aid in improving daily operations. Over time mostly depends on the facility its self, in KCMO no over time at all no holidays. Here in Tallahassee when I first started no over time, now they are allowing due to the need for nurses, other facilities that offer all the over time you want, you really don't want to spend any more time there then you have to. For a little more information, there is a Facebook group 'psych travel nurses' you can request to join, there they post current openings and pay, you may also ask guidance from other travelers.
Good luck to you.