When you do it all yourself, you have to spend a lot of hours. One time I posted a job in Spain and I got 350 replies, so I had to navigate through all those replies, find and read CVs. I had to filter good cover letters and check CVs for relevant experience. After that I had to get the information that was not on the CV. For example, they might say they know English, but they don't mention on which level.
Candidates with good CVs have to complete a small test, so they could see what kind of job they are going to
do. I used to do an IQ test in the beginning, but not every job is about intelligence. Some jobs are about attention to detail, creativity etc. For each position you have to design a specific test that would be focused on particular abilities needed for this type of job. A 15 minute test will not mean you know the person, but it can give you an idea of their ability. Then you need to have an interview with the ones that you find suitable for the job.
For busy entrepreneur, it is hard to conduct the interview the way it should be done, because of current tasks. Entrepreneur ends up rushing hiring procedure, hiring a person who seems good and then training them for 2-3 months to suddenly realize that they don't really work the way you wanted. And then you have to start the whole hiring process again, or, which is the worst thing to do, keep the person who is not right for the job, because you don't have time and energy to look for somebody else.