I don't know much about sleep schools except that most teach controlled crying which really isn't my cup of tea. (If you want to know more about it read some of the wonderful articles here on BellyBelly.)

My daughter was a terrible sleeper from the time she was 1 till only a couple of months ago. For a while there she was waking up every two hours and making my life miserable with no sleep. What finally worked for us was one of the techniques in Elizabeth Pantley's book, of sending daddy to comfort and settle her every time she woke up. We took it slowly, intially I got her used to being re-settled by me without using the boob to put her back to sleep using only patting and singing (most of the time). Then daddy started going in early in the morning to her for a few days, then he went in any time after midnight for a few days then it was only daddy every time she woke up. She didn't like it at first and would whinge and take a lot longer to settle and a couple of times started crying and screaming so that he had to give up and bring her in to me. But eventually she started settling for him a lot more quickly and easily so that he only had to say, "Sophia, lie down please" and she would just lie back down and go back to sleep! After that she started sleeping longer stretches and then one night she didn't wake up once between 8pm and 6am and we couldn't believe it the next morning. Since then she has been great with only a few unsettled nights here and there and they've always had a reason, like she's sick or teething.

If you're having trouble night weaning or even if you don't know if he's ready I suggest giving the ABA a ring as they might have some tips to help you.

Anyway, good luck with whatever you decide to try. And don't despair, there is light at the end of the tunnel.