Reading out loud and speaking!

<<Translating is easy when you're doing it with written materials..>>

Depends what is the written material. Poetry and literature translation takes great knowledge of nuances and both languages in great depth. Technical translation is easy however.

There is nothing "easy", everyone want to be a genius but when it comes to do something practical few people have skills

Problems you can encounter when you want to make a good translation from spanish to english:
http://en.wikipedia.org/wiki/Spanish-English_translation_problems
I think these or similar problems exist with all languages.