The Starting Point
The most important thing you can remember about the start of your PhD journey is that you are a long, long way from it.
This is more important than remembering your first meeting, the first paper you read or even why you wanted to pursue a PhD!
You have done more. You know more. You can do more.
You are more knowledgable, more capable and far better at what you do.
Remember that whatever else has happened in your PhD you have come a long way. You have not got this far through luck. You got here because you are good at what you do. You can build on that foundation to be ready for your viva.