Aww, cute! Be aware that at 6 weeks, the puppy's not going to have good control of their mouth. There's a good reason why most breeders wait for 8 weeks to send puppies home. Sign up for a basic R+ Puppy Class to help prevent later problems, and to ensure your dog is a good, calm, well-rounded dog as an adult. Believe me, it's the best investment you can make on a dog.
I hate to make a pest of myself, but I will if I feel strongly enough... A shock collar? On an
infant?? Look, Pyrs are not Labs or any other retrievers or spaniels or hounds. This hard-handed B.S. is so unnecessary it makes my head spin. Someone mentioned that their Lab puppy was rough on the birds... Well, yeah! Labs are
bird dogs! Pyrs are not Labs.
You did yourself a favor bringing home a Pyr for a flock guardian. Love! You know how you "teach" a Pyr to guard livestock?
Take 1 Pyr, add livestock. Voilà!
Since you don't have an adult Pyr to show the puppy the ropes, you will be the one on introduction duty. Put the puppy on leash and walk them on a tour of your property line every day. Encourage sniffing, exploration. The dog will need to know what scents are "normal" and which are... well... Pyr have to deal with "them" someday! Encourage the puppy to "#2" on the property line, as a working Pyr will use fecal marking to deter canids. (You may even want to start distributing poop around the boundary, to get the puppy used to the idea and to start the process yourself!) Introduce the puppy to the livestock on-leash, just to be sure it doesn't get overexcited and start chasing -- it is a puppy, after all!
If you run against problems, consult an experienced livestock guardian trainer. Most likely they will be thrilled to throw free advice your way. (Don't fall for just any idiot with an electronic collar and "training experience". Consult with someone who has experience with training flock guardians!)
Ideally, the Pyr will grow attached to the livestock and regard themselves as a "flock member", passively hanging out with your livestock and waiting for those predators. Honestly, it should take almost no "training" at all -- this is the one job the Pyr has been bred for, and they should take to it like a Lab... to water! (See? I don't dislike Labs. They're just... on the opposite spectrum from this sort of thing.)
It's not a bad idea to have two Pyrs, but I'd encourage you to space them at least 6 months apart, just to reduce the puppy process pain.
Here's a cute article about Great Pyrenees and poultry guarding:
Great Pyrenees Livestock Guardian Dogs