You must perform Weapon Skills and Skillchains on monsters that con Easy Prey or higher.
You receive 1 point for opening/soloing a weaponskill, 2 points for closing a Lv.1 Skillchain, 3 points for closing a Lv.2 Skillchain and 5 points for closing a level 3 Skillchain.
It is not necessary to remove the weapon in order to see when the latent effect is removed.