Nothing is used, since the entire writing system is known. It's just a matter of learning the language.
If you are talking about the first deciphering of the hieroglyphics in 1822, that was done with the help of the Rosetta stone.
It was hard for him to interpret the document because it was in hieroglyphics.
Example sentence - Other than creating hate and discontent, it was difficult to interpret the actions of his nasty daughters.
Yes, they did.
Recent discoveries of ancient writings found that the Kush did use hieroglyphics. Their style of hieroglyphics was very similar to that of the ancient Egyptians.
No, but they used something similar to it though.
no
The country that people had used hieroglyphics was Egypt.
The country that people had used hieroglyphics was Egypt.
Ancient Egyptians used hieroglyphics as their alphabet.
Moche
hieroglyphics
yes it was their most common type of writing