sandiklaws: if you planned showing your SQ Silkies, it would have been better to tie up the crest, rather than trim it~~it will take a long time for it to grow back in. If you don't plan on showing either of them~~clip away. Another alternative is to "pluck" the feathers around the eyes so the bird can see better, but it doesn't compromise their appearance.
As for foraging for food~~Silkies aren't very good at that for several reasons. Their vision is obstructed by their crests (feathers on top of their heads) and their beards (though some Silkies are beardless). Also, with their heavily feathered feet they aren't as good at scratching for food, and definitely cannot run away from predators as fast. Free ranging is not a good idea either, since they cannot fly.
Good luck with your new babies.