Normally, you will get experience for accessories in three ways: participating in battle, performing an action, or killing an enemy. Go to Hunter's Forest. The enemies that are there are the weakest. Equip the accessory(ies) you want to level up and get into a random encounter. Kill all except one of the enemies. Then, just defend for a while. You will gain one point for each action, even while defending. To speed up the process and make it easier, equip all your characters with an accessory that has HP Recover, such as a Holy Orb or a Tireless Ribbon. Equip one character with a Hunter's Orb or a Muscle Ribbon for Prevent Escape. Also, equip the character who has the accessory you want to level up with an Ascetic's Orb or a Feeble Jewel for Skill EXP. Finally, you can set the command to memory in the configure menu, then defend for a turn in battle. After that you can keep X held with a rubber band or some other method and leave the battle running for about thirty minutes (provided that your party is strong enough not to be killed by then). By doing this you should be able to max out one or more accessories. Note: Some of the accessories listed above need to be leveled up in order to use the abilities mentioned.