By simply putting out a potty chair in your bathroom you enable your child to gradually make independent attempts at experimenting.
If your child is ready, but is not big enough to get on and off the toilet, consider purchasing a potty chair rather than just a potty seat.
Children can become so attached to their potty chair that they are unable to practice using different toilets, such as the one at grandma's house or the mall.
In some cases, this type of potty chair can motivate kids to want to use the potty, but it can actually scare some children.
Just make sure that, when used as a stool, the potty chair is sturdy and stable.