easy-peasy, just time consuming... you can do the same, actually, but you will need --
a) good lighting, b) camera that can support .raw file format, c) wide-angle lens, d) shoot using .raw files that you later can process d) photoshop or lightroom, to process .raw files, e) time, loads of free time to invest into it!
NB: but things are a little easier if the photos are plus-minus all the same, in terms of lighting and exposure. -> it means you can sit and work on one photo polishing it 40 minutes, and then automatically process the rest photos using the same setting. easy-peasy! I wish you a successful growth as a photographer too!