I wouldn't tell her beforehand. That makes it seem like you're completely preoccupied with your size and lack confidence (whether it's true or not, it's not something she needs to be thinking before she's had a chance to fuck you). This is a complete turn off, whether the guy doing it is tiny or huge.
You need to go in there completely confident in your abilities (fake it if you have to), because that in itself will turn her on. Study up on your technique (mouth, hands, penis; all of it), and get her super turned on (and preferably get her off) before you even whip out your penis. If you've sufficiently wow'd her already, your size is going to be way less of an issue. If it's even an issue at all.
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