I had a lot of help from my hubby, he would feed one and bring the other to me in bed to b/f if he woke up before he was finished with the first.
I didn't realise but Des was 'training' the boys to woke up at seperate times

he would quietly get one and then take him out and feed and play with him then put him back to bed and wait until the other one woke up

After I had had a child awake for 3 straight days

I was close to breaking, thats when I found out what Des was doing and 'fixed it'.
I would leave the first one to wake for a few minutes (not crying just making noises) to give the 2nd one a chance to wake naturally and if he didn't I would wake the 2nd child. It took me a week or so but I had them trained to wake and sleep at the same time by 8 weeks old.