Although many small projects can be handled with relative ease, such as a repaint or cabinet reface, and may not require the full services of a professional kitchen (or bath) designer, I’d still recommend seeking the services of a professional kitchen (or bath) designer for an hour or so. They can have a look at your plans and offer expert advice and specific recommendations. They also may catch something crucial that you may miss, or not even be aware of until it’s too late. Often, it can be the best money you’ve ever spent.
However, if you’re planning a complete kitchen or bath renovation or a new build, I’d highly recommend seeking the full services of a professional designer. With so many options available across all aspects of the design process, from layout, to appliance and fixture choices, to current styles and trends, it makes sense to have an expert to help guide you through the process. An NKBA member designer ensures a very high level of expertise.