Every level your cap will go up by 5. Make sure you have the pickpocket macro set to all your openers and you will get plenty of Junkboxes to keep your skill up to date.
/cast Pick Pocket
/stopcasting
/cast <opener>
I also have an additional line on my Sap since most of the PUGs I end up in don't understand to wait for the bonk on sap before engaging.
/charge
Enjoy.