Learning Arabic & Persian
I'm also studying Persian and Arabic and I don't have lots of problems with it. It's not like studying two Romance languages at the same time. There are lots of similar words of course but otherwise they are so different that it's quite easy to switch from a Persian into in Arabic mood.
Steve hasn't posted here in a while :(
If you know one of these languages well, you will find it easier to learn the second language, because many words are the same. Grammar no. If you don't know any of these languages well, don't learn them at the same time. It may be very difficult for you, because the same words are pronounced differently and the grammar is completely different.
اتكلم العربية واريد ان ادرس الفارسي أيضا
هيا مدرس معا وانا مسرورة بمعرفتك