Shins aren’t your main concern as the calves on any flat pedal convert will testify. It’s your calves that get chewed the most; they’re soft and fleshy and they bleed like hell! Fortunately it doesn’t hurt much, infact hardly at all.
The main point to make with the transition (which I did myself about three years ago) is to stick with i,t at least for a few months, and try to be consistent over that time, i.e. don’t switch back and forth.
You might find initially that you’re constantly trying launch yourself over the bars whenever you try to jump. That’s because you’re used to using your feet to pick up the bike rather than your arms and legs.
You will loose some pedaling efficiency, so to compensate you need to spin a lower gear at higher revs. This is a good thing to learn anyway as it’s far more efficient than grinding out a big gear. You may already do this anyway.
Don’t try to go all ‘fast and loose’ foot out drifting corners, attacking the apex with a Sam Hill style dab. You’re just going to bin it asap. Learn to ride the bike and get comfortable with the feeling first; the looser style many riders enjoy from riding flat pedals (and by the way you don’t have to ride flats in order to be loose – it’s just that most of us aren’t the Athertons or Peaty so we need a little more help), will come with time as your confidence grows.
There are a number of advantages (and disadvantages) with riding flats, but chief among them for the majority of us is the ability to very quickly dab a foot if things get too hairy. That boosts your confidence but you only get that once you’ve become confident in riding flats in the first palce.
If you stick at it, then it’s a great way to improve your bike skills.