Someone has truly said that NO DESIGN IS GOOD OR BAD. The criteria of a design depends upon taste of various persons. It can differ. It is the job of an interior designer to create something that provides experience to people and to make an ambience aesthetic. Basically, an interior designer is a person who is employed to decorate a place it can be a residence, an office , café, showroom etc.
An interior designer starts his work with measurements then he make planning for the specified area then comes elevation of every single wall. When he is done with this work he makes 3d views for the project. Then comes plan for flooring, layout of false ceiling with electrical drawings. Many clients want their home to be decorated by following the Vaastu. So the Interior designer must have the knack of Vaastu as well as design.
There is a thin line between an interior designer and an interior decorator. A decorator can be anyone who can buy things from market and do the decoration but a designer is one who has qualification on this field as then he will get to know about every trend which is spreading in the market.
A designer can work under an architect or can open his own firm after working as an employee. He must have all the practical knowledge. Because an interior designer is the one who can make a place functional, safe and beautiful by selecting good artifacts, suitable lighting, pleasant colors and durable materials. He must also be aware of building codes and norms. He should also visit the site to inspect the work whether the client is satisfied with the design or not. They work with architects, civil engineers, mechanical engineers, laborers and workers. They must have knowledge of sketching, computer aided design(CAD). Some are specialized in residence, in office, in landscaping or in kitchen. They can design workplaces from small scale to large scale.
For a good designer you must be a people person. The best way to get more sites is  mouth publicity. If you have done a good work you will get more work of if there is any loophole in your work there will be no goodwill of your firm in market. They should balance their design and client’s desires.
Competition is fierce in interior design. This business is competitive.
The more you know the better your work will be. It’s not about your style it’s about theirs which means choices of client must be superior , you cannot design  a place according to your taste. You  must put your own aside.
With a little hard work you can become a good Interior Designer with interior designing course in jaipur.