We’ve written many stories on how bad an empire is and how intolerable it is to live under one. Empires love massive armies, police forces and Weapons of Mass Destruction, all the better to hold us in an iron grip. We cannot live under an Empire, so how do we go about fighting one?
Allies! The Original Trilogy shows us a unified Rebellion winning even against the much larger and more formidable Empire. Luke stands valiantly but doesn't stand alone. He has family, friends and even strangers with whom he shares a common cause and they too have family and friends, all fighting their own critical battles. It takes many people working together to raise and run an Empire (however Palpatine may wish otherwise). It will take nothing less than many people working together to break one, but not even the most powerful Sith Emperor is enough to stand against a united people.
The problem, as Andor shows us, is building that unity. Through Cassian's bewildered perspective we see a fractured rebellion, or many different ones, and how each fails. Most of those failures boil down to infighting. Whether rebel members hate each other more than the Empire they're supposedly organizing against or one member of the group sells out the others, the rebellions in Andor are ineffective because no one works together.
The first step to defeating fascism is always to band together. Reach out to like-minded friends and family or join or start a group with others who are also being oppressed by tyranny. Let go of your hate and mind your ego, otherwise you may push away potential allies. Worse, you may start acting too much like the Empire you seek to fight, no matter how much you deny it.
The Mask of Fear shows us the start of rebellion through Bail Organa’s idealism, Mon Mothma’s practicality and Saw Gerrera’s boldness. All three have allies. All three have also suffered horrible defeats. The Delegation of Two Thousand's petition to stop Palpatine's power grab was another casualty of liberty's death. On the other side of the Galaxy, Saw had just seen the Separatists defeated only to be replaced by the far more powerful Empire. Yet all of these rebels would overcome their initial loss and prepare themselves for the long haul.
Even in the Original Trilogy, the Rebellion at its mightiest couldn’t fight toe to toe with the Empire. The Empire still has a larger and better equipped military force than the Rebellion has at its height. The Rebellion does this in the Original Trilogy and if the attack hadn't been a front for another plan they would’ve lost.
The Rebellion succeeds not through strength but through trickery. They couldn’t face the Empire head on but they could strike at its weakest points. Luckily Empires with iron fists typically don't encourage cunning or trickery among their people, so they can be outwitted and outmanned in other ways.
For the likes of Lando Calrissian and Mon Momtha the trick is outwardly feigning loyalty while inwardly directing the resources under their power away from the Empire and towards Rebel forces. For the likes of Han Solo and Chewie it meant being faster than fascists because they're only in trouble if they get caught. For Obi Wan and Yoda, it means passing on what they know about fighting fascism to the next generation, because this fight will always need to be fought.
But it's better than living under an Empire.