I wouldnt say I'm really organised and calm but we're also not really chaotic either. I still struggle to juggle everything but I've made lots of improvements the last few months since having ds2. What works for us, won't for others. All about finding your balance and what works for your family!
Things I've learned:
Declutter. It's far easier to keep the house tidy and clean when there's less crap lying around!
Lower expectations. I always thought I needed to get out and do day trips to the zoo / farms etc and spent a lot of time feeling guilty. I realised the guilt put me in a bad mood and ds1 was getting a grumpy mother. Playing in the garden on a sunny morning is enough for my dc right now (3 years old and a 4 month old who chills in the wrap while his brother plays). 3 year old has the best morning ever pottering about, riding his bike, jumping on the trampoline, playing in the sandpit and it was really easy just walking downstairs (it's a shared garden). It's enough and I'm much happier realising this!
I have a great husband who is 50/50 and very hands on. We're forever tag teaming to get the kids ready / keeping them occupied to let the other get some things done etc.
I meal plan and do the weekly shop online.
We have a joint app for budgeting and every time we buy something, we pop it in our app and we can see what we're both spending and when to start being careful.
They're all different but I have to restrict TV because my toddler's behaviour is so much better when he watches less TV. He gets 30 minutes a day, sometimes a hour but that's his limit before he changes into the hulk.