Unless the axles are somehow damaged all you will need to replace are the axle seals and the brake shoes themselves,
Yes the phillips head screws have to be removed, on some models there are two more holes in the face of the drum to insert threaded bolts to remove the drum, simply thread the bolts in to remove the drum.
make sure handbrake is off take wheel off hit the drum with a mallet not steel,as it will brake,hit on outter diametter face of drum, try and rotate as you twist off
jack up one side at a time without the ebrake on as that will engage only the rear brakes remove lugs and have a good hammer handy and tap on the drum until it will pull off
Behind the brake mounting plate there is a small hole with a rubber plug on the top portion.
Remove the plug. Look from the back of the vehicle and you will see a star wheel in the hole. Stick
a long skinny screw driver with a large blade and rotate it in the direction of risistance.(clockwise).
You will hear a spring poping noise. Rotate a few times and the drums will turn freely.
Then you can slide the drums off.