68 GTX Rear Axle Bearing Help

Is this picture taken through the end of the axle? Is that the end of the axle from the other side? Should I fix one side at a time and put it in before I pull the other side? Thanks for all the help. Mike

That's how I would do it. You should be able to see the thrust button with a good light. Also, no need to panic if it does fall out. The 8 3/4 is a very simple unit to work on.