There is a great wealth of knowledge in the AR forums at the tab located above.
FYI They are Tapered. So one end is bigger than the other. Compare and drive them out the bigger side.
If its a strait pin barrel. The pins will be the same size on both ends. In which case drive them out which ever side is easiest.
Most of mine are from Right to left side to get them out. But not all of mine have been like that.