With a newborn and large boobs I found it easiest to feed with the boob on the bed, so if lying on LEFT side, then use the left boob and on the RIGHT use the right boob. What you do is you put baby with his tummy toward yours on his side, you hold his back with the arm on top (so if lying on your left, your left arm is used to prop you up and the right arm is used to get him latched and then once latched to hold his back.
Use pillows under the arm to prop your arm or head. I always got DH to put the pillows under my head and to help position my son next to me. Gosh I am sure I am making this much more complicated than it sounds !! It is actually quite easy, just needs practice !
What we did with our double bed: make sure one side of the bed was against the wall, and the other side we had baby's cot firmly in place, he was closed off on both sides and couldn't fall off.
There are these special cots with the one side down so you can put baby right next to your bed, but roll him back into his own cot once he falls asleep, but not sure where you can buy these.
The other thing (I wish someone had told me !!), newborns love being rocked to sleep ! If you can get something to rock him in, it is a great way to settle them.
If I had another baby, first thing I would buy would be one of those rocking cots or some kind of baby hammock ! I also used my baby car seat a lot for rocking baby in. Once he was asleep we would lift him and put him into his cot. Car seats are a funny shape, so not very good for baby's back if you leave them in there for many hours.
As for sleeping on top of you, in fact this was something I loved ! He would sleep on my tummy or DH's tummy during the day. I would lie down on the sofa (I never ever fall asleep during the day, so no danger of cot death) with the remote and watch TV or read a book for 2 hours at a time while he slept on top of me. It is a good time to relax. Again, if you are likely to fall asleep like this, perhaps lying on the sofa is not a good idea.
They usually recommend against lying down with a baby on the sofa, but in my case there was no chance in hell that I would fall asleep as I am a very light sleeper, so I did it any way as I was in full control of baby and myself !
Another method, put a futton or another kind of mattress down on the floor in your bedroom or living room, with a TV nearby That way the baby is on the floor when you lie next to him and he is safe. This method really worked for us too.
MTM - do you have a bf adviser near you ? If you tell me whereabouts you are I can give you the no. for La Leche League or their national helpline no - the leader at LLL or any of the mothers with more experience will be able to show you how to feed lying down.