Air Force to Army? (Blue to Green) Can I keep my career field?

I'm a very timid person (that's what I've been told at least). So just wondering if I'd get eaten alive? I'd imagine I would lose at least one rank and assume that there's no possible way I could get into the same career that I am in now (since I heard they only let E-6 and above into that career field). Thanks!

Basically I like my career field but I feel like the enlisted side gets held back.