i don't think there is a guide actually, surprisingly. Feel free to take a few photo's and write a guide up when you done. Its not hard though.
In brief, jack up whichever side you having the issue with.
Take the wheel off and the 2 bolts that secure the drum.
With handbrake off remove the drum, can be stubborn but keep pulling and wiggling and tapping with hammer, it will come off.
Working at the rear of the brake, remove split pin holding handbrake cable to the actuator lever, and remove the cable from the lever.
I find it easiest to just remove the brake shoes and everything to get the thing out although it supposedly possible to do it without i just don't bother attempting it. Can be quite hard to get them out when they are seized solid just due to angles; if you really can't manage popping the hub assembly off makes it alot easier to retract it but you should really replace the hubnut if you remove it and its mighty tight bolt too, decent breaker bar required really for that one unless your are hercules.
Once off soak it in WD for a bit, wire brush it til its properly clean and moves without restriction. And then a bit of copper slip on the joint to help it stay free moving. And refit, everything i just said in reverse.
And if you can be bothered at that point, may as well do the other side as well.