Fleet Composition

Improve your rebel fleet (ships and pilots) and you'll have no problem. It will also help you in fleet arena.

If ur using chimera I'd recommend using ur hounds tooth and maxing his survivability. He will buy u enough time to get ur chimeras main ability out. Then just improve the other ships to try and get 3* on the mission.

You got Han's Falcon, just get the rebel pilots & Bossk geared up, will be putting it on auto in short order. The difference having gear on your pilots makes is astounding.

And also 5* Gold mods, don't have to be good mods but 5* gold (eventually 6*) is also a big thing with ships.