Feeding two at the same time is easier with a Boppy Pillow-- double football hold works for mursing both at the same time, but feeding them bottles with one in a Boppy and one on your lap also works. You could also use two pillows- one baby/ pillow on each side of your lap if using bottles.
Two sideto side swings have saved my sanity-- made my life easier! It lulls them even in their most cranky, but every baby is different. Finding what soothes them is tricky. Swaddling, shushing, sucking on a pacifier, and background noise (and sometimes ALL OF THEM TOGETHER) soothed my twins as young infants well.
Weego makes a great double carrier if they can't be parted from you at all. It's a bit pricey, but if it works...
And lastly, letting them cry a bit in a safe place to restore your sanity won't harm them. Don't feel guilty-- you can only do so much at one time. You will make it through the first year :-)