Go ahead! You will find that the vast majority of people are friendly. Especially if you go with an open attitude and interested in the cultures you pass through.
First: take a good spanish class. Although there are people who speak english around, they will really appreciate that you took the time to learn spanish.
You will also find most of the facilities in the cities equivalent to what we have in the north. The countryside is usually more primitive in infrastructure.
Check out
www.jupitalia.com for Ted Simon's adventures around the world (twice!). And there are other good sites and books to help you.
It is a great world. May as well live it.
Tchau,
Reynaldo Osoterrenos