I have a client who built an ecommerce store many years ago. He's been paying somebody in India to SEO the site for him for the past year. He recently hired me to build a brand new site in Magento on a different host. One thing I'm worried about is that once we flip the switch and point his domain from the old site to the new site we're going to lose a ton of traffic. Does anybody have any tips on how to make this process not hurt so much?