Like you & Dani my first smear test came back showing changes (severe high grade dyksarosis)
It was a complete shock to the system & I ended up spending hours scoring the internet worrying myself even more so it's such a good thing you have found this site as it was the most useful thing to me in my hour of need.
Again as Dani said colposcopy is just like a longer smear test but they will have a good look at your cervix & may even project it on a screen which you can see if you wish.
Any abnormal areas will show up & you may be offered treatment at the same time if your clinic does this (some do & some don't)
If you don't have treatment you will probably have some biopsies taken but again you should barely feel these, I just had some mild period type cramping for a little while afterwards.
The waiting is the hard part unfortunately but try to keep yourself busy & remember abnormal cells are so much more common then you realise. I bet if you was to openly discuss it amongst you girlfriends they will all be able to tell you of somebody or even themselves that have had abnormal cells or treatment. It just seems fr some reason us women don't discuss our smear tests openly!