Pretty simple Mc, wipe the bore with a cleaning patch on a jag and rod a couple stokes to remove any excess lube, pop a couple caps to clear the fire channel, pour powder from a measuring device, lay lubed patch on muzzle centered over bore, place ball in center of the patch, use a short starter or the ramrod(depending on how tight the PRB is) to start the ball into the bore, push the ball down bore with short strokes keeping your hand close to the muzzle and seat it on top of the powder with some force, the same way each time you load. For lube, I use BoreButter for hunting, and Moosemilk for trailwalks and practice, I've also used spit.
For cleaning, put a cap on the nipple or use a small piece of leather to seal the nipple under the hammer, pour some hot water in the bore, brush the bore a few strokes, you'll have to twist the brush clockwise in the breech area to reverse the brush, do it before it reaches the bottom or it will be real hard to pull it back out, dump water, rinse, uncork the nipple, pour more water, use a patched jag on the rod to push water thru the bore and out the nipple, repeat a few times until the patch is clean, hot water again, the hotter it is the faster the bore will dry, wipe, lube, preferably with a non-petroleum product, I like BoreButter myself. Clean the fouling from the lock and breech area, remove the nipple, clean fire channel with pipe cleaners, clean the nipple and reinstall. If I intend to hunt with it, I'll apply some beeswax/neatsfoot oil mix to the threads of the nipple to seal it from the weather.
Tim
