The “sons of Aaron” were the priests God ordained to offer sacrifices unto him. 
King Uzziah decided that he was just as capable of burning incense. He went into the temple to offer the sacrifice. The priests tried to stop him, they warned him, but he wouldn’t listen. 
That offering wasn’t accepted by God. Instead King Uzziah had to face the consequence of going against what God had put in place. 
There are several members to the church. The Lord has chosen different people for different ministries. Keep yourself from the “I can do this by myself” attitude that King Uzziah had.
It doesn’t help anyone, including yourself.