Hiring the right person can prove to be one of the most difficult challenges for a manager, new or old. I've had every possible outcome from hiring over the years.
I've hired someone who performed very differently on phone technical screens than on the job and spent a ton of effort trying to coach to skills that should have been brought into the job.
I've hired superstars.
I've hired people based on the recommendations of others, with mixed results.
I've hired people multiple times for different positions, where they excelled in some and less so in others.
At times, I have thought hiring might be as accurate as a coin flip.