Great walkthrough for Defera!
I'll just add:
-You can tell if City is bugged (well, if it has the oldest, most common, not-yet fixed bug) by looking at the borg along the wall in the area (there are 4 areas to do this mission in). There should be 4. If there aren't, then it's bugged and you can start the mission and wait 7 minutes (sometimes every area is bugged.)
-To find a team, ask in Zone chat on Defera, the only place in STO where Zone chat is useful. write "lfg fed (or kdf) hards". If no one invites you, then invite the next person who writes that to your team.
Or ask in fleet chat. If I'm around I'll usually go.
-Just to reiterate what Andrea said for everyone: it says "hard" but it's not hard at all! Come along the next time someone in the fleet is looking for a team! We'd love to have you! We don't mind showing you around and helping you get Fleet Marks, Borg Neural Processors, and dome dil!