First of all, you have to have a basic understanding of gardens, and CAD drawings can be understood. On this basis, you can sign up for a class, and then they will teach you how to budget. After learning, they will give you a software and an electronic dog, and you can do it. After working for a few years, you will be admitted to the budget department, and your salary will go up with the increase of experience. If you rely on self-study, it is still quite slow, and the quota alone confuses you. I'm a designer, but that's how the budget officer of our company came. This industry is ok, her salary is close to 5000.