My biggest advice would not to force your child, wither they are strong willed or not. When your child is ready, they will let you know. I have a girl that works with me (who thinks she knows everything) and she is determined to get her 7 month old baby (this is her first) to be totally potty trained by a year old.
Parents who say that seem naive to me and think that when a child is potty trained somehow gauges their intelligence. It doesn't. At all. It's the potty.