Not all lesson barns or all lesson horses are alike.
Nick Peronace comes to mind.
Caution = check references, watch some lessons, etc so you don’t end up at a place that has lesson horses or an instructor or other riders that increases your risk.
For example an indoor that has two or three lessons going on at once can become a zoo, and increase the risk. A place with several arenas, which dedicated one the reriders or new riders decreases risk. One that requires private or semi private lessons for reriders or new riders decreases risk.
Yes falling off happens. To the best and worst among us.
But it’s a risk that can be mitigated.
Caution doesn’t mean don’t. It means make sure that you, and where you end up mitigate the risks as best possible… And then yes, risk still exists, but less.
For example, How new is your helmet?
If it’s > 5 years old, go to several tack shops and try them ALL on. All of them.
Find the one that best fits your head, regardless of price, and buy it. So you have it well before you find the barn.