That's really strange that you have a problem with that because it is set up in a mechanical order/sense. On the rear, the top screw is the hig and the bottom screw is the low. Right tightens the limits, left loosens the limits. On the front, even more basic. Inside is for the inside limit (low) and outside for the outside limit (high).

As far as turning the barrel, if you turn it the wrong way you'll know. If worse comes to worse turn the barel till it begins to jump up onto the next cog, then back of about 1/4 turn. You should be right in the ball park. This takes about 20 seconds so it's not like you can screw up without written instructions handy.