Getting a multisite live

My website was converted into a multisite last weekend. The site contains 93 plugins.

My development house was supposed to use the back-up from last Monday to migrate the site from a test environment to live, but made a complete mess of it.

Since I’m not a developer, my question is, are there specific instructions for migrating a multisite compared to a single site? Is it really that difficult to get a site live as an exact copy with all the functionalities in place where they were in the testenvironment?