Convert a site to a new template

I have a working site in Joomla and I have purchased a new template. I would like the site converted to the new template using the menues of the new template plus all the other fetures of the template with the ability to switch between the templates. There are baout 30 pages in the site. It is a regilious not for profit orginisation so please only apply if you have no problems with an orginisataion such as that. This should be a short project for a strong Joomla person. 'relateconnect dot com'. Thanks Peter