I did the Chile, Patagonia and Easter Island trip last month. I have previously done Argentina and Brazil, Peru, Equador and the Galapagos Islands. I love South America as there is so much to see and as regards the Unrest in Chile, don't let it worry you. We were in Santiago when the rioting took off and we were never in any danger. Just You and their agents in Chile were on top off the situation at all times and our safety was always their number one priority. As it had just started there was some inconvenience with the curfews etc but don't let it put you off. As for plucking up the courage to book a trip, you will find after your first one there is absolutely nothing to worry about, everyone of your travelling companions will have felt the same way