Unequip all your gear first

Go to channel 7 of Calderock Village

Equip 'Lucky' Title (5% Enhancement success)

Have exactly 7 of each Rough Jewel in you inventory

Collect 10 "Will of the Veterans" (dropped from last boss of Mino nest)

Your money should be at 7g 7s 7c

Time the animation of the blacksmith such that he's striking the anvil while you enhance

Gratz on +10 or +13 item.