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Visiting spaces that have been designed by a professional interior designer or decorator will help train your eye, enabling you to learn more about the most desirable trends.  Pay attention to color schemes, space planning, and small details. Keep a notebook with you and record your observations, both positive and negative. This is a great way to grow and learn as a decorator. Keeping up-to-date with the most relevant decorating and design trends will help you build a decorating business that will attract your ideal clientele. You will always want to be one step ahead of your clients on the design front, suggesting to them the newest design concepts that are beyond their imagination.  Some magazines you should look at include: Architectural Digest, Better Homes and Gardens, Country Home, Design Directions, Elle Décor, Home Restoration & Remodeling Magazine, House and Garden, Interior Design, Interiors & Sources, Metropolitan Home, Style at Home, Traditional Home, and Victorian Homes. Make sure to review commercial interior design magazines as well as consumer-driven interior design. Understanding the way your space works is fundamental to interior decorating. Design is visual as well as physical. Elements of design include balance, emphasis, movement and patterns.   The single most important element of interior design is lighting. For example, there are three forms of lighting: ambient lighting, which provides overall illumination; task lighting, which provides light for specific activities; accent lighting adds focus to particular elements of the space. Focus on developing you own style and interests to give your decorating business a unique and personalized touch. Do this so that people will seek you out for your particular specialty.  Developing your particular niche interest will help your business be more marketable and attractive to your clients. Your business will do best if you're able to find a type of interior design that's being overlooked in your local market. Find every opportunity to practice trying out your ideas of interior design to improve your skills. Discuss your end visions with an experienced or professional decorator or designer. For example, take a random swatch of fabric or paint chip and attempt to design a room (either mentally, through sketching, or using a computer) that incorporates those details. Learning how to take pieces of a puzzle and create a full picture is an essential part of becoming an interior decorator.  Realize that learning more about interior design takes time. You'll learn more skills over time. One way to get training and practice in interior design is to find a job working for someone who has her own business. You'll learn more about what starting your own decorating business will be like.
Visit high-end spaces. Read relevant magazines. Know the basics of design. Find your focus. Practice your interior decorating skills.