How do you start building an archive and library of ordinary peoples’ diaries? By taking in one box of diaries.
How do you start a hot-air balloon festival? By getting two hot-air balloons together.
How do you start a sail-cargo business? With one hold of cargo.
How do you start writing your Customer Experience Score? By writing down one business process.
By starting. Small. By not worrying about what will be needed to make the big thing a success. Most of all, by moving from “Someone really ought to do something about this.” to “I’d better do something about this.”