Hi Java,
That's actually a very easy style to wear. It's very casual and your don't show any hair line so you won't need to spend time getting the hair line perfect. You're 21 years old and you should be able to pull-off the 75% density. Paul is right about the body wave. The beauty of this style is that it's so casual---easy to wear without the need for a lot of 'mirror time.'
John