i did this s1 in 2008. you have lectures where you learn the culture and history of spain (south america in s2 i believe), plus 3 hrs of tutorials to learn language. No its not intense, there are enough similarities to English to make it not appear entirely foreign, and if you already have a second language, or have an ethnic background, with some Spanish roots it will be even easier. Im Filipino and I easily got a distinction in this without trying too hard, and people asked me why my pronunciation was so good for a beginner, since my background isn't readily famous for its Spanish heritage. So if you have a South American heritage, that would be even better!
However I noticed Caucasian Australians having more difficulty with pronunciation, grammar and sentence structure, and remembering lots of different words, but Im sure its not impossible if you are determined enough. Just dont do it because you think it would be cool to fire off a whole paragraph in Spanish, because it could take a while to get there!