LyX is a powerful WSYIWYG editor for LaTeX. I am an avid user of LyX since it allows for a highly productive environment for writing text and formatted math while continuing to allow for a high degree of custimizability. LyX is an open source version of Scientific Workplace which is both more modern and has broader compatability with standard LaTeX.
LyX is cross platform and works equally well on Windows, Linux or OS X.
These videos comprise a basic introduction to LyX and cover the core tools needed to write a Thesis or paper in Economics or Econometrics (and many other fields, especially in mathematics, statistics or social sciences).
Some people prefer a written guide. Fortunately (for me), a good guide has been written (by others) and is available at Lyx Guide