Financial errors may cause a few accounting or budgeting headaches.
Happiness isn't about working yourself into an early grave so that you can buy things that you don't need in order to impress people that you don't know or like. Don't get caught up going round and round in a cycle of endless consumption. It won't bring you the happiness that you seek. It's just a distraction.
Once you have tackled a particular task or skill successfully and can do it with one hand tied behind your back, look for a way to improve upon your success. Never stop looking for ways to improve or better yourself or your work.