sorry,I don't think so ~ For I have some experience to teach my friends from GuangDong speaking mandarin correctly,I find it will trouble you as you learn them at the same time if you can't be sure your mandarin is good enough so far. And as a student majoring in Chinese language and literature,I thought the grammar in mandarin and conntones has some differences in many circumstance.Especialy the prounanciations are talltally different and it's probablely make you get many wrong prounance at both languages . 不好意思，我认为同时学习广东话普通话并不合适。我曾帮助来自广东的朋友纠正普通话发音，经验告诉我，如果你没有相对熟练地掌握了普通话，而同时学广东方言，对你的学习不宜。 况且，广东话和普通话的语法很多情况下不一样，而且发音完全不同。 我建议你先学好普通话。