What tedious work?

In order to answer that question, you would first need to know how to make AGI (this is not known to anyone).

In order to know how to emulate human intelligence, you would first need to understand how human intelligence is constructed (this is not known to anyone).

In order to understand how human intelligence is constructed, you would have to understand how human cognition works (this is not known to anyone).

In order to understand how human cognition works, you would need to understand how the exact mechanisms upon which human brain works in the first place function (this is not known to anyone).

I could continue, but you should get it by now.