I would like to hire a Microsoft Exchange Expert

We have a client that needs some Exchange work done pretty quickly, Exchange is not our expertise. It had crashed after being infected and partially encrypted. We were able to remove the extortion-ware and other malware. And we would able to restore and rebuild it so it was operational. However they need some cert changes done because autodiscover is not working on the public side. We have a new cert we generated thru Digicert because they were using self signed certs, however this is were we went into the weeds and need help. Now we get "You do not have permission to view this directory or page" even after trying to put things back the way they were. We need assistance getting this working with the new cert. To add complexity, the Exhange 2010 is setup using the older method that you used to use SAN to use both internal and external names in the cert, since that is no longer allowed we need help making the changes so the same names for autodiscover, owa and mail work for internal and external. DigiCert has some tools to help automate this, however we would feel better even if the tools were used having someone with the expertise to know what the tools are doing so if something doesn't work they know how to fix it. We are a specialized hosting company, small and looking for someone to help with this and possibly future projects as we don't want to become Exchange experts. And we don't know how many hours these changes might take based on having someone who knows what they are doing performing the work. Thank You