(I thought you meant short people and was prepared to weigh in
)
I did attempt a degree of self sufficiency a few years ago, sadly I got sick and had to move away. I had a decent sized garden and an outbuilding. I focused on growing fruit and herbs - things that are expensive and delicate. I also dabbled in unusual crops. There were some old walls, so I started to train anything I could as fans, espaliers, etc. I kept quail, then rabbits, to get some sort of meat production from otherwise wasted things. The rabbits could eat weeds, whereas the quail could have all sorts. The quail were quicker to grow, but not as versatile in that they needed higher protein inputs.
My main difficulty was (and still is!) getting things to germinate at the right time in the right number to keep a constant turnover of crops, leaving no space empty.
I found it useful to look into forest gardening and permaculture principles in order to make best use of my available space - various levels of shade, quality of soil, etc.
I'm sort of trying the same thing again now, though currently without critters.