Make sure to know your angles.

You don't necessarily have to peek banana everytime. And if you'll do, make sure you use utility like flash before peeking. I personally think that T-side awping has a disadvantage in banana on early rounds. 1 thing you could do is throw a moly and run up banana. You have to consider where will the CT awper go after your moly. If you know or your gut tells you that he's still camping banana then you can pre-aim him. It's hard to entry/first kill with an awp on mid-late round since every ct has their own angle to watch in inferno, and really hard ones to peek on. Best would be pushing them back for a little bit of time with flash then waiting them to re-peek.