Kerry you should see a screw in line with the handle.it will be inside the door lip by the rubber seal. It is holding the barrel holder in to the handle .Turn the wrench to undo the allen pin that holds the lock part in, but dont screw it right out or you will be in a bigger mess.Put the key in and turn it to the left at the same time you can pull on the handle as if to open the door than the key section holding the barrel should come out from the door.. to work on .Mind you dont loose the small springs . All the tumblers need to be level .From what you have said you will find one or two sticking up .If you are unable to make them high ones level just remove them .I do have pictures but the up loading as gone very slow.