Here's my take: it depends. The labor you discuss may not even be going into making value in the Marxist economic sense of the term, especially if someone is doing a specific service for your. If you pay someone to paint a room or fix some appliance and they are self employed then you aren't exploiting them. They use the money you pay to cover the cost of the tools and material and their wage. It may be possible they are "exploiting themselves" if they are underselling their own labor services. In this case, you care about the use-value of the product or service. You aren't appropriating their product and selling it for a profit on the market. You don't care about the exchange-value of the product. You are like their customer.
Surplus value, and exploitation, come into the picture if you hire this person to make a product which you then sell. Perhaps you contract them to design a shirt or paint a room, but your goal is to sell that shirt or room (house) on the market place for a profit. In this case it is the exchange-value of the product that you care about, not the use in itself. You don't care for the room or the shirt for its own sake, just how much money you can get from selling it. In that case the worker would make value in their labor, and by appropriating a profit from the product of their labor you are able to exploit them.
You may still give that worker a "fair wage", but by selling their product and realizing a profit you introduce the real possibility of exploiting them. You are able to use that profit to afford consumption items which have value in excess of the value (or labor) that you yourself provided to the economy. And the worker creates labor (provides labor) in excess of the value of the consumption items their wage affords them.
It sounds like you are just hiring someone to do something personal for you, like painting your room. In that case I believe you're good. ;)
It's all about the web of social relations. That very same action (like painting a room) can take on so many different economic forms once we start asking how this action fits into the larger picture of production.