Yeah, for me its hard to study two or more languages at the same time. But there is an exception, it depends on the language you want to learn, there are languages quiet similar. Like me, I born Filipino, our language is Tagalog. We'd been into mixed races and mixed dialects already. So some of our language are Spanish, some Bahasa, some Chinese, some English..etc...and easy for us to learn that kind of language simultaneously. At present, am learning chinese and I tried Italian short course, my problem is time as well the diction..its contradicting. Sometimes I pronounce some Italian word into chinese diction..hahahah! What is important also is to prioritize which is most needed for your work or whatever purpose you have had. I think, English is best to learn because its universal language. But if you are goin to countries having that Spanish language, better study that one. Ciao! =)