That circuit would be difficult to "create" even for people with years of experience and who knew how to understand schematic diagrams.
Note that all of the components are flea-size, surface mount which is difficult enough to design, produce, and assemble.
But further, note that some of the board layout and some of the components are very critical to the proper operation of a switch-mode power supply (SMPS).
SMPS are among the more difficult circuits to work on, and I would NOT recommend even a thru-hole version of this SMPS as a beginner project.