I went for 0.5 ml but was advised to use a bit less than that as it was my first time. The girl was totally right and I'm so glad she didn't just pump the whole vial into my poor lips! She was really great at tailoring the filler to suit my face and focused on the centre of my lips, creating a pout that was clear of duck mouth!
I had very mild swelling and had NO bruising which was such a relief. I put Arnica cream around my mouth in a bid to present bruising so think that may have done the trick. I iced every few hours for a minute or so during the first day.
Only annoying thing is my lips are really dry and no amount if lip balm seems to fix it.