Have a schedule. Go home for dinner. Incorporate kids into your social activities - take them out for dinner, or do what you want to do and bring them along. Block off time on weekends to just be with your kids and family. You can also optimize your schedule, where for example you'd be chopping vegetables for dinner, while the kids are eating breakfast.
Put ads on all the places that accept ads for a nanny. When you work full-time it is easier because you need a nanny for full-time, it's harder to match up with a part-time nanny. Talk to them, find someone with experience, call their references, and try to hear how they hang out with kids and what the interactions are like. There will be tradeoffs and you might want to have backup child-care, like grandparents. Preschool is a great way to keep your keets out of home.
It is hard to have someone living in the house with you all the time, and even if you spend a long time selecting the right person, you might find out they are really not a great match in the long run.
You might get less interested in novel experiences. Traveling to a difficult place, for example, would take 2-3 times work more. You hit some kind of boring middle-aged mentality where you want to do one more active thing before you get old and die. You also spend more time thinking about big-picture life events.
The swing or a car seat is a good place for your child to sleep in if you have to keep them upright. Compromise and put them at an angle. You can also elevate their mattress a little to make them feel cradled.
Take turns with your partner. Get enough sleep when you need it. Go to bed earlier. Get a nanny if you can afford it, have grandparents help out. Get all the help you can get, you would need it. If you have friend who have children just like you, swap playdates. It is easier to take care of a group of children when they can play together.
Yes. You do not have to respond to their every desire. It builds resilience. Think about it - do people jump and respond to your every need as adult? No. Maybe it is good to condition your kids to not expect that either.