Hello there and welcome to BYC!
Chicken claws can be fairly long and still be ok. I have one hen that has plenty of access to dirt and sand all day long and she still has to have her claws trimmed every few months. The first time you trim the nails, they will probably bleed. But after about the second trimming, the blood vein in there backs way off and if you need to keep her claws trimmed, it is much easier without the vein so far up there.
So get yourself some guillotine type dog nail trimmers, some corn starch and some alcohol wipes. Towel her up and lay her on your lap on her back, head at your belly, feet hanging out. At first, just trim off a very tiny bit. Like an 1/16 of an inch or so. If it bleeds, wipe the claw with the alcohol wipe and pack it with corn starch. You will probably have to pack the bleed again with corn starch. Do each toe nail and pack any that bleed. Keep her in your lap for a few minutes to make sure the bleeding stops and you can then put her back in the coop. I like to keep them on something clean and dry for at least 30 mins so the nail hardens over enough to keep crud out of the bleeder. I have never had any issues with infection. You can check the nails an hour later and you shouldn't be able to see anything.
If they are still long and need trimming, wait a week or so before you repeat this procedure. Again, after a few trimmings, the blood vein will start to back off so you can safely trim without any blood.
Before you trim her claws, post some pics up here or on the another thread so you can get input as to whether they actually do need trimming.
Good luck with your babies and welcome to our flock!