Hiring the wrong person is expensive and very time-consuming in the end.
Here are some rules –
1) The more of a hurry you are in to hire someone, the greater the chances of making a mistake.
2) The more candidates you talk to, the greater the chance you will hire the right person.
3) The more times you meet with a candidate and the more situations/places you meet with them in before you hire them, the greater the chances you will hire well.