First time traveling alone through Johannesburg Airport – any tips?

Hi everyone! I am traveling 'alone' for the first time, and I’ll be flying from South Africa to Angola soon. The problem is that I don’t know Johannesburg AT ALL, and the airport feels HUGE and confusing.

For those who have travelled through OR Tambo Airport (Johannesburg):

Is it easy to find the gates and connect to international flights?

How early should I arrive?

Safest areas, things to avoid inside/outside the airport?

Tips for someone young and traveling totally alone?

Im a bit nervous, so any advice would help a lot. Thanks!