DS taught himself started to teach himself how to use the potty at around 14 months. He learned how to take off all of his diapers at around 11 months, so he was usually naked, which btw I believe really moves the process along because they really start to see the cause and effect. Like "oh, when I feel that pressure there and press down like this stuff comes out! Hey, look at that! I can make it go different places too!". This is a good experiement for out in the yard during the summer time! We ended up having him naked most of the time and he would help me clean up if there was an accident. However, just a little while into this, he started asking for his diaper when he had to go. I'd put it on him and he would pee and then we would take it right off. At around 14 months we bought him a potty and he used it 4 times the first night! He used it off and on from there. At one point he decided that he liked standing better, so I put him in the tub to pee since his aim wasn't so good. By 16 months he was doing very well over night and everything. By 18 months he was consistantly using his potty or the toilet at all times. Another thing that I think helped is that around the time when he started to show an interest I started having my DH take him in the bathroom with him when he had to go so that he could see what needed to be done. This caused caused joyful giggling from my little boy and at 2 years old is still one of his favorite parts of the day. They have a daily appointment when DH gets home from work to go pee-pees together. I'm sure DH would love to know that I am sharing this! He once commented on how it's a little off-putting to unzip your pants and have the room fill with laughter!
Anyhow, we pretty much just followed his lead. So this has been our experience, I don't know if it's of any help to you, but I thought I would share.