To add something, which is pretty important: take some time to learn the basic process. You may be surprised to learn, as I certainly was, that sharpening is something that can be accomplished with a fair amount of practice and a patient attitude. Of course research and asking questions helps too.
Start w/ a simple stone--Norton crystalon or maybe an India or even a diamond plate--and a couple cheap supermarket knives. Practice raising a burr the whole length of thr blade. Then, flip it over and raise a full length burr on that side. After that, deburr it. Try to hold the same approximate angle for both sides. As you begin to understand and get good then start to test shallow edges, wider angle edges, smooth versus coarser edges etc. This will help you understand what works, what may not work, and what edges are appropriate for both the knife and the task at hand.
When you have developed this foundation and *then* send your knife to one of our resident sharpening experts, you can really benefit from their services. Not only will you have a better appreciation of the process, but you will be able to *actively* participate. Maybe you need a regrind at a certain behind-the-edge thickness for slashing vines on your property. Or maybe you cut a lot of rope so you need a coarser edge. Perhaps a hollow ground cutting edge and a zero ground tip. Maybe a mirrored edge brought to 30k for shaving (straight razors can benefit from an edge like that). As you can see, the possibilit3es are endless.
The main point is that only you have the most knowledge about the situations, environments and tasks concerning where and how you will be using a particular knife. By having a solid understanding of both the concepts and the actual hands-on mechanics of sharpening, you can guide your sharpening professional and together produce the most efficient, practical, and well-suited edge for your knife.