ordinarily, people ask how to un-curse an item for their own safety after obtaining it.
i am curious as to why you want to curse an item.
or is that your intention?
because it sounds like you want to curse something and then gift it to someone.
it sounds like you are willing to spend effort, energy and perhaps money to curse someone.
i can tell you this.
the worse thing you can do to someone is to leave them be.
completely cut them loose.
i can also tell you that if you know how to bless something, then go opposite of that.
i have never consciously cursed an item with the express purpose of doing wrong to someone.
you sound like you have an enemy and want them to know it.
must be pretty bad thing to cause you to go so far.
please keep posted as to your intention and progress with your cursing an item.