It is possible to fix this yourself, but realize that the valve on the tub/shower is holding back huge amounts of water under high pressure. Make sure you know how to shut off the water to the house, and make sure you do it. You'll need to get the proper parts at a local hardware store and have good understanding of what you're doing. Try this link: http://www.rd.com/how-to-repair-a-leaking-tub-faucet/article17727.html
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It is possible to fix this yourself, but realize that the valve on the tub/shower is holding back huge amounts of water under high pressure. Make sure you know how to shut off the water to the house, and make sure you do it. You'll need to get the proper parts at a local hardware store and have good understanding of what you're doing. Try this link: http://www.rd.com/how-to-repair-a-leaking-tub-faucet/article17727.html