Baby groups and classes will not benefit your newborn baby what so ever in any way shape or form. You don't need to be out of the house by 9am every morning to meet other mums and their babies so you can drink cheap coffee and compare milestones. Your baby needs you and only you, your baby doesn't care at all about anything in the world apart from you. Do not stress yourself out by trying to keep up with other people who do 19 groups per week and swimming classes and baby sign language classes. They do not have 'little Einstein's' they have too much time on their hands.
If you want a routine, start putting it into place now (dark and quiet at night, no rocking to sleep, introduce a comfort etc). I said 'if' so don't @ me if you don't agree with routines.
Have muslin cloths and bibs everywhere in your house. If you have 10, get 50.
Invest in a bouncer/playmat so you can put baby down while you get some housework/cooking/toileting/showering done. You don't need to take a baby to the bathroom with you, nothing bad will happen if you nip out of the room for 10 minutes. And it's absolutely fine to not hold a baby 24/7. You've carried the child for 9 months it's perfectly ok to not want them glued to your hip as well for the next three years.
It is perfectly okay to live off ready meals and take aways right now. And if people are visiting request food in plastic tubs that you can freeze and re heat. Get snack foods, biscuits, bread(toast is a great meal post pregnancy), those pasta in mugs, cup of soups. Anything you can make in 2 seconds while the baby is asleep.
If you don't want visitors then tell people that. You don't have to have people round if you would rather it be just you and your new family.
Ignore any advice you get from the health visitors, they really know fuck all about fuck all.
Guidelines don't have to be followed if you feel another way of doing something would suit your family better. Whatever you think is best for your baby is 100% best for you baby, you know that because you are the mum.
Take pictures and videos. I know people tell you time goes fast but you don't realise how fast time goes until your baby is a toddler and you can't physically remember them in the early days.