Try taking a look at !combatfootage@sh.itjust.works or !combatvideos@sh.itjust.works for a while, watch some Ukraine war footage, and realize that as bloody and horrific that war is: Both side are nearly at parity in military strength, and neither side is capable of air superiority.
Now imagine civilians with hand weapons going up against the most advanced, funded, and well trained volunteer military in the world with an unlimited budget and legendary logistics.
Your suggestion is only remotely possible if the military and the industial complex behind it fractures and joins the rebellion in a sizeable amount, otherwise it's suicide.
I mean, thousands of international volunteers traveled to Spain to help during the Spanish Civil war. The same is true for Ukraine and to a lesser extent, Rojava.