Flow charts with lots of nodes

I have a flow chart component with lots of nodes and it's overwhelming for the user to be blasted with it at once.

There are approximately 100 nodes in the flow chart. I like that it gives an overview of the entire flow chart - but it's really messy.

I've thought of adding a fixed window, scrollbar, and radar to know where they are. Does anyone have any thoughts on how to present flowchart with lots of items?