nails??

Ive noticed one of the new girls we got last week, the ex battery hens, has quite long nails that slightly curl.  My question is, can i trim them or will they file them down themselves now allowed to go free range.  It sure is heart warming to watch these girls go from lil scaredy cats to venturing round my feet and coming up to me and having 1-2 strokes before running off.  So if i can trim them, is it like cutting dogs/cats/rabbits etc etc nails and is there a visible wick???

thanks for that