Remember, if they don't work out, you can remove the peepers easily, they aren't permanent. But be aware that it takes 2 people to put them on, one to hold the bird, and one to insert the little nubs into the nostrils. If you soak the peepr in very hot water, it will soften it so it's easier to bend. You don't need a tool. Practice bending it first, so you become adept at manipulating it. It might help to find a youtube how-to video.