I was the first female Capt on Eyre Peninsula (and still the only 1) but I have found that nearly all guys are good to work with...it helps that I've now been a Capt for 8 years and have earned some respect.
The only guys that are a problem, would probably have issues with women in any environment ie mcp's very sad but true.
It is also VERY important that the girls go in with the right attitude and consider themselves to be on the same level. I loathe to have it highligted that I'm a female firefighter...I say that I'm a firefighter, like the other 15,500 in SA! We are all 1 team..and we have different areas of abilities.. women may not be as physically capable BUT they might be better at IMT etc..