When gearing up equipment, it's very essential to keep in mind that you should be cautious. Exactly what we imply here is that when you gear up a particular tool on a hero, the equipment is stuck there till you change it, or "force-unequip" it. When you change a piece of equipment, the old one gets ruined, without any possibility of getting it back, or redeeming it in exchange for gold or other helpful item in the game. When it comes to the 2nd, more "strong" way of changing equipment, you'll have to use Crystals for that, and the only way you can earn this currency is to sell heroes you not requirement or desire in your party. Rarer tools require more crystals to force-unequip, though you need not fret if you're still in the early phases of the game. Once there, you will not need to invest a lot of crystals, as you'll mainly be stuck to one-star, or typical equipment. Once you start getting higher star rarity equipment, you'll require to have a strategy of sorts, and make sure everybody gets the right piece of equipment.