Hiring a person through whom you want to get your work done,is a complex process just because, it needs a lot of looking into the matter as well as ascertain his/her reliability. And hiring designers, more so.
While hiring a designer, always keep in mind that you need to have a clear view of your goal which goes without saying that your objectives show be well defined as well as have the enough clarity. It is necessary that while choosing a designer, you look for someone whose designing style matches your preferences. It is also preferable that you go through sample works before settling for any designer.