Not the full tour de france week, but a quick 5 day highlights spring time holiday
Rode round liege, rode somewhere else for a day, climbed two climbs then rode round the paris rush hour.
The Col de la Croix de Fer was last seen in 2008 on route to alpe d'heuz, just riding up that one climb is not a full tour stage.

Can an amateur handle the toughest stages?

Yes, can they keep in the time limit? No.

proof? Kenny van Hummel 2009, dropped on most stages.

http://www.youtube.com/watch?v=rTPKaeFbcA8

http://www.youtube.com/watch?v=PzuQ
we_yqas&feature=related