How to let a 3rd party install a CMS?

I've had a wordpress-based site designed by a third party. I've created the requisite db, but they need to install WordPress themselves, since it's heavily customized (I can't use the one-click install or manually install the standard distribution).

How can I give them enough access to install WordPress under my "home" folder (under /home/username/domain.com) without actually giving them my password to the main shell account?

I've tried creating a restricted ftp user, but that user cannot access my "main" account folders. Is there another way, or do I have to provide them with my most sensitive DH password?

Thanks in advance for any suggestions.

In reply to:
How can I give them enough access to install WordPress under my "home" folder (under /home/username/domain.com) without actually giving them my password to the main shell account?

I've tried creating a restricted ftp user, but that user cannot access my "main" account folders. Is there another way, or do I have to provide them with my most sensitive DH password?

Setup a subdomain with a new user and different password, give them those credentials. Then when they are done copy the install from the subdomain user to your domain user. Ask them not to hardcode the hostname (ie, you don't want them to put something like http://subdomain/ in a template when you're going to run the template on http://domain/ and disable the subdomain eventually) and to provide instructions on changing the config files where they had to use http://subdomain/ or /home/subdomain-user

Customer since 2000 cool openvein.org

1. Change the user password.
2. Allow pros to install your site.
3. Change user password back to what it was.

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How to let a 3rd party install a CMS?