Busa, Good Luck. I have been in my own business since I was 18 dealing with our most precious commodity which is people. Learn how people are wired up. Some advice below.
The harder you work, the luckier you will get.
A man convinced against his will is of the same opinion still. Don't argue with customers, its a time waster. Its a lose lose situtation.
You can be right or you can be rich................. but you can't be both. Pick one and stay with it. If you like to be right all the time, you are going to be poor.
What I have noticed is there is always a pull between time and money. If you have lots of time you have no money and if you have lots of money you have little time. Thats the way it seems to work most times. Just ride it out.
This decision will come by many times weaving in and out of your life. When it comes a choice between money or ego, pick the money everytime.
And if you are not in your own business and made it up. You are going to be Birds double bitch. Deliveries in the front and rear. No holes barred.