@TangBloodyFastic - please don't worry (I know that is difficult) - it will not be as bad as you are dreading it will be.
The thing that I found helped the most was realising that I didn't have to rush round and do things when the baby napped during the day - I could sit down and have a rest or even a nap too. Ds1 wouldn't nap for long in his moses basket, during the day - but he would sleep if I held him - so if I wanted him to nap, I had to sit down with him.
If I remember correctly (he turned 27 this year), I would sit either on the couch or on a chair with fairly high arms, so he was tucked towards one side of me, where the back of the sofa or the arm of the chair would stop any risk of him falling, if I did nod off.
Co-sleeping at night can often help too - yes, you still have to wake up to feed and change the baby, but the baby will fall asleep more easily afterwards, tucked up next to you in bed. Or, if you don't want to co-sleep, you can use a next to the bed cot (I can't remember what they are called - sorry).
One thing I used to find was that putting the baby down into a chilly Moses basket used to wake them up - so I took to swaddling them in a blanket before feeding them, and then the blanket insulated them from the cooler mattress in the basket, when I put them down. Plus, little babies like being swaddled because it reminds them of being in the womb, and makes them feel secure.