Top floor windows

For the top part of the building there are circle windows so I have been looking for a good tutorial that isnt using booleans.

I have managed to find one via creativecrash :
http://www.creativecrash.com/maya/tutorials/modeling/polygon/c/cutting-circular-holes-into-planar-meshes-while-maintaining-good-topology

The images I am also using to help get the detail for this are:

The tutorial shows the basic move in order to make the circle. To create the cuts I went into 'top' view and used the split tool. I then pressed 'enter' to set the lines in place.

I was on a roll with it until I pressed the wrong key, and now it wont go back to how it was so looks like I will be starting this over. I love how ever when following a tutorial things can still go squiffy.

Well during my 5th attempt Maya closed! Might be a hint to move on to something else.