I think it was always being to be difficult unless they had natural gift or talent. Several of Beckhams peers have sons who are now footballers
But being in the public eye from the start and almost under pressure to be, or do, something special is a difficult position. If hed gone, as a teenager, to work in a garden centre or a pub or coffee shop, the media would have probably mocked him for that....that it was too ordinary, and hed somehow failed. If he wasnt a "known" name or face, he might have had that chance.
Obviously the conventional way to become a successful photographer or chef, is first to have a talent or aptitude for it, then start with basics and work your way up....but through the Beckhams connections he was probably offered an opportunity they all thought was too good to turn down. (And then was ridiculed because he was, really at a beginner stage, and not ready to publish a book, or have a cookery slot)
If you look at VB she's become a world famous fashion designer....because she wanted to, not because she's spent years cutting patterns, designing, going to college, hunched over a sewing machine for hours on end. Despite all her protests about working hard, she did bypass a lot of steps that any other aspiring designer would be taking.