Answer

It is possble to get a certificate after four days of instruction. But you won’t be any good at feng shui. You won’t be any good as a professional.

You’ll just be another fraud for me to write about.

You need to study under the guidance of a good teacher for a minimum of 40 hours (just to get the basics), plus have at least a year’s worth of independent study (also with guidance), with analysis of at least 100 structures (and your work reviewed by an instructor).

Then you might be capable enough to consider charging people for your services.