It's worth getting an expert to teach you.
If you couldn't swim, would you do a quick internet search, then throw yourself into the ocean to give it a crack? Not likely.
"The difference between people who are self-taught and those who are taught properly seems to be how long they carry on doing it. In order to get this meditation and for it to be as effective as possible, you need to do everything we do in the course. So you’re completely self-sufficient and having very deep, effective meditations."