I found it was better to leave a couple for brightly coloured potties around the house just so my daughter wouldn't see the potty as a threat or something to be cautious about, that way when she was ready I just sat her on it to see how she reacted and if she became uneasy I backed off for a bit and introduced it into her play with her dolls, putting them on the potty and praising the doll when the dol had done a wee or poo, I found role play helped a lot, this can also worked for other areas too.