Can you learn how to do yoga properly at home?

Slavanna
I wanna start doing yoga, but my schedule is... well, unpredictable to say the least. One day I have classes until 11 AM and then go home, another day I'm out of school after 6 PM (keep in mind that school starts at 7:30 everyday for me, so after nearly half a day there I'm pretty exhausted). The only times when I can actually afford to do yoga is late in the evening (there ARE evening classes in the nearest city, but I live in the suburbs and I would end up without any way to get back home for the night) or in the morning (and unfortunately, there are no yoga classes at 5 or 6 AM that I know of in the nearest vicinity.

So I would like to start practicing daily in the evenings. I have an iPad app for yoga (the FitStar one), but I'm worried that without an instructor, I may end up doing the routines wrong or even hurting myself. Is it possible to do yoga correctly without an instructor?
Can you learn how to do yoga properly at home?
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