When King Saul saw that David had the potential to fight Goliath, he put a bronze helmet on David's head and covered him with a coat of mail. David also fastened the king's sword to the armor but he took them off because he had not tested them. (1 Kings 17:38-39)
David thus went to fight Goliath with just his staff, 5 smooth stones and a sling. (1 Kings 17:40)
David took a stone, slung it, it struck Goliath, sank into his forehead and he fell to the ground. (1 Kings 17:49)
With just a sling and a stone, David was able to bring down a well armed and protected giant for Goliath had:
a. a bronze helmet
b. a metal coat weighing around 125 lbs or 60 kg
c. bronze armor covering his legs
d. a bronze javelin
e. a spear with an iron head weighing around 15 lbs or 7.5 kg (1 Kings 17:4-7)
Level 2Once Goliath was on the ground, David had moved to another level but the job was not finished completely.
There was no sword in David's hand and so he ran and took Goliath's sword and cut off his head with it. (1 Kings 17:51)
1. Believe in YourselfDavid was not comfortable walking with King Saul's armor and probably wearing the metal coat of mail would have affected his slinging abilities, and so he wisely took them off went to fight with the weapons he believed in.
Therefore have confidence in yourself and in the training God has placed in you because if David did not believe in his abilities, he would not have told a whole king, "I have not tested them" (1 Kings 17:39) and taken off armor that the king had put on him.
2. Ignore LosersIf David had listened to King Saul, he would not have been able to fight Goliath successfully. I dare call King Saul a loser because for 40 days Goliath had taunted the Israelite army and none of them had gathered the courage to fight him.
Therefore, learn to politely ignore the advice of people who have been unable to successfully deal with the challenge you are facing. Do not defer to their opinion just because they are older than you or they have more clout.
3. Believe God Will Help YouTo have this level of self-confidence you have to believe that God is with you like David who boldly declared, "I come to you in the name of the Lord of Hosts, the God of the armies of Israel." (1 Kings 17:45)
4. Believe God Will Provide For YouDavid fought the first level of the battle with the tools and skills and when he got to the second level the tool that he needed was provided. The technique was also provided since Goliath was now on the ground.
Therefore maximize using the skills and tools you have at your current level and have faith that God will impart the skills and tools you need once you get to the next level.
5. Subdivide your ProblemBreak down your gigantic problems into several smaller problems because when you view a problem this way, it becomes more manageable.
For example if you have fight a Goliath divide the problem into:
a. Challenge 1 of getting Goliath to the ground
b. Challenge 2 of cutting off Goliath's head