Use a Nipple pump first

I bought the Avent Nipplette about 3 months ago when I first found out that I was pregnant. I have large breasts but not very bigg nipples, and I was worried that once my milk came in that my breasts would be even bigger, and I would be unable to breastfeed.
I don't know if it was that my breasts were too big but I was unable to get much suction and they kept falling off. I bought a simple nipple pump(they are widely available from online adult shops, and are not very expensive) I pump my nipples fit ten minutes until they are erect and then use the Nipplette, which I have gradually increased the time of wearing to 8!hours. My nipples are now beginning to stay erect and they are huge! Ideal for breastfeeding and my husband loves them too!