Information Technology (IT) is a bit like having spent too much time trying to find just the right outfit to go out in and then rushing to get to the theater only to get caught in a lot of traffic and finally sitting down to watch the movie (that you've waited all week to see) after it has already started.
So it's time to settle in with your computer (a bowl of popcorn at hand) and begin. The bits you've missed so far will soon become evident . . .