Franco,

Yes, you can do this with GE only, I actually created the KML on a computer that didn't even have GE or Keyhole on it. I strictly used notepad and excel. (Plus the GPS data from triphazard). When you get to the part in the directions (from previous post) about a standard path, do the following:

Open notepad. Copy the following:
Code:

---

 <kml xmlns="http://earth.google.com/kml/2.0">
<Placemark>
  <name>Flight Path</name>
  <styleUrl>root://styles#default+icon=0x307</styleUrl>
  <LineString>
    <tessellate>1</tessellate>
    <altitudeMode>absolute</altitudeMode>
    <coordinates>


    </coordinates>
  </LineString>
</Placemark>
</kml>  

---

Paste your coordinates (from the CSV that you are editing in notepad) between the <coordinates> tags above.
Save the file as a .kml.
Open the .kml file in GE

I hope this helps. Let me know how it turns out.