2 different people have done it.
One did it for under $1000, but that was with free labor.
Another the price tag was about $2500 including parts and labor.
You would be better off you sell your auto car and buy an 5 speed car.
The switchover is not easy, nor is it cheap. Used 5 speed trannies run between $400 and $1000. But you can get some of that back by selling your auto tranny.
Find a shop familar with Hyundais, or at least imports. Ask them how much to replace an auto tranny. Then ask them how much to replace an auto tranny with a 5 speed. Prices should not differ by more than $500.
Leave it to Random to Needlessly complicate things.