People usually can't wait to get started with their Spanish classes. It is a fun way to prepare for their time abroad.
However, most people tend to learn more when they take classes during their stay in Latin America, instead of their Spanish classes at home. Hearing and speaking Spanish all the time, not just during classes, makes it easier to progress.
Classes in Latin America are also very inexpensive! You will not only save hours of time, but also a lot of money. Waiting to start taking classes in Latin America is the best way to go.