How difficult is it to learn Portuguese from Spanish?

I wish to learn Portuguese, but the University I am attending only offers Spanish. I have elected to learn spanish, but was wondering about the extent to which my knowledge of Spanish will be transferrable to Portuguese?

If it helps, I’m pretty good at learning languages.

Knowledge of Spanish makes learning Portuguese alot easier, that’s for sure. So it will be easy, especially if you’re good at learning languages.

Here’s a podcast for spanish speakers wanting to learn Portuguese (Specifically Braz. Port)

http://tltc.la.utexas.edu/brazilpod/tafalado/index.php