The price loading twice is likely caused by dated files within your child theme or a 3rd party plugin. I’d suggest testing with the child theme deactivated first, before doing the below.
1) To hide to the second price.
.product-price-wrap.clearfix {
display: none;
}
2) You would need to edit the Woo files to make that change. It looks like that link below the button is generated from a plugin or a custom modification? atelier/woocommerce/content-single-product.php
.
3) What plugin is powering that popup/link (“VIEW RING SIZE GUIDE”) insertion?
Thanks.