TFS 2013 wizard allows you to proceed to verification even if you have no SQL admin access
Had an interesting issue during and upgrade from TFS 2012 to 2013.2 today. The upgrade of the files proceeded as expect and the wizard ran. It picked up the correct Data Tier, found the tfs_configuration Db and I was able to fill in the service account details. However, when I got to the reporting section it found the report server URLs, but when it tried to find the tfs_warehouse DB it seemed to lock up, though the test of the SQL instance on the same page worked OK. ...