Is anything difficult?
Taught by the right person and with the right interface, any concept can be grasped simply.
Example: “The example I like to give is back in the days of Roman numerals, basic multiplication was considered this incredibly technical concept that only official mathematicians could handle,” he continues. “But then once Arabic numerals came around, you could actually do arithmetic on paper, and we found that 7-year-olds can understand multiplication. It’s not that multiplication itself was difficult. It was just that the representation of numbers — the interface — was wrong.” Source: https://medium.com/re-form/the-utopian-ui-architect-34dead42a28
43 * 98 looks difficult to do in the mind, but with a pen and paper, it’s middle school math.
When you’re in flow, time passes with your productivity soaring. When your body and mind are against it, no force on earth can help you accomplish.
Conclusion: Given the right mentor, interface, tools, and determination you can learn anything.