Site Transition

I want to transition a Web site I have to WordPress.

What I’d like to do is create a subdomain, develop the site on the subdomain, and then move WordPress to the primary domain after the work is done.

Example:

1. Site is on: http://www.fubar.com (not the real domain name).

2. Create http://wordpress.fubar.com and install WordPress on it.

3. Get WordPress to have the look and feel I’d like it to have.

4. Create all of the same content on wordpress.fubar.com that is currently on the www.fubar.com.

Now, I want to delete all of the content on www.fubar.com and replace it with WordPress.

5. Delete www.fubar.com content.

6. Install WordPress on www.fubar.com.

Since the database was created and configured [once I completed creating the look, feel, and content on wordpress.fubar.com], I want to use it on the primary domain and not create a new database all over again.

My question is: How doable is this (can I install WordPress again and just use the database that was already created?)? If so, there will be little down time for my site while I transition it.

Or will I do all this work and then have to build a new database and create the content all over yet again?

If this is not doable, is there another way?