Haha, I am no hero believe me. I'm a total wimp and cannot stand to hear DS cry for even a second. But I remember what the first trimester was like last time and I just cried at the thought of being up all night nursing.
Anyway, I tried the Jay Gordon method and had very little hope it would work. He cried (but not too hysterically) for about 40 minutes the first night. It was hard but you're allowed to cuddle, talk and soothe so I got through it. And after he had been crying for 15 minutes or so, I kind of thought I had to see it through, or I would have put him through that for nothing. The next 2/3 nights he cried for probably about 10 minutes.
And now he just rolls over, snuggles his bum into me (he loves being spooned) and goes back to sleep. I was 
, believe me. It hasn't stopped him waking up yet but it has only been a week and he has come so far already, so I'm hopeful.
The next stage in my grand plan, once he is used to this, is to substitute my warm body for daddy's. then I can get some proper kip before dc2 arrives!
Interestingly, he asks for boob less now during the day as well, even though I haven't started weaning in the day at all.
I agree that the book recommended above is worth a read. It's very good and, most importantly, honest about tandem nursing. I don't think it's for me, all in all, I found feeding one newborn hard enough. But I have 8 months to wean very slowly and gently!