It's certainly possible, but you're unlikely to be able to achieve the same level of quality as luxury designers, and you'd need to have a good level of knowledge of interior design concepts like the use of space and how to select well-matched colour schemes.
It will also depend on the nature of your refurbishment. If you're just hoping to redecorate an existing space by making changes to furniture, flooring, lighting, and decorations, then you should be able to achieve this yourself. If you're looking to make structural changes to room layouts, then you'll likely need to consult specialists before going ahead with any plans.