I would forget this tutorial, download qt-win-opensource-src-4.5.2.zip and compile Qt with nmake from Visual Studio.
Then I would learn how to deal with qmake and pro-files. I would read a lot in the Qt documentation, especially about qmake. I would write a pro-file fort my software and then I would use "qmake -t vcapp" command to generate a Visual Studio project for my software. Then I would use VS as a very good IDE.

Or download the Qt SDK which include an IDE (Qt Creator) and MinGW as compiler. All inclusive, no extra software required.