It's also when you find the right person for you and your shop. I was lucky to get my first full-time employee about a year ago. Since she was finishing her education they have a programme where the students come and work for almost "free" to get work experience. This girl was very talented and willing to work hard and did work great, so after the first couple of months there was no doubt it would be right for my shop to add the first employee.
I must admit it was scary at first how to manage to pay salaries etc. but I also find the stress relief worth something. Now I can have her work and don't feel like everything stands still while I'm away visiting customers or something, so the effect of getting your first employee could be more than just the actual work hours they provide. Of course it depends a lot on the person you find, wrong person and you could be up for a disaster (real life horror stories from colleagues...) Maybe you could try to have someone for a short time, let's say a month or two and see how it works out? If it's right, then you feel it's right - if not, you haven't lost a fortune and knows better what to look for in an employee.