I've been using it for a while and it's no more or less complex than other DAW software packages. They all have a learning curve. I'm most at home with Logic Pro, which is a lot like Cubase (or at least, used to be). Really, it's just a case of sitting down and doing it. There are no shortcuts.
I will say though that the Reaper Wiki is very useful.
Anything to Declare, Mr. Wilde?
I Have Nothing to Declare but my Genius.