All these things must be learned before you can be competent in spell-work. Along with this one must learn that a thoughtlessly cast spell won't work, if they are lucky. If something does, go wrong, responsibility for the effects of the spell lands solely on the caster. A large part of responsible spell crafting is considering the details and all the potential repercussions of your efforts. By not taking into consideration every detail about the effects of the spell and knowing intimately how the spell was created, the effects will be unpredictable at best, at worst disastrous.
Love spells are among the most sought out.
None of these spells can actually create love. At best a very weak-willed person might be placed in a sort of magical servitude to the caster. They are not free to love anyone or anything and they certainly won't love the one who cast the spell. More problems arise when the caster no longer has the desire to be with them. Then they are stuck with a person who truly needs to be in their presence.