don't bother a friend of mine is great with hair and she couldn't even get those things to work well. it seems like a piece of the plastic is always showing unless you use 50 million pins to keep your hair in place.
just learn how to back comb your hair it's not that difficult, but if you have heavy hair then it is and you have to use a curling iron technique thing. i don't really feel like getting into that but i'll look around youtube for that.