Baby sling / baby carrier is just miraculous. First daughter with second wife was crying a lot and we had to carry her much. With the sling you can basically carry the baby and still have the hands free and keep on with your stuff.

You also have to learn to recognize the stages of sleep. Hold the arm of the baby up and down. If the arm remains in the air, this is light sleep. If the arm feels heavier and goes down all the way, this is deep sleep. Only then put the baby into the cot. This is quite important to know.