A quote concerning Jacob and his preparation to meet Esau (who had years ago desired to kill him):
"Jacob prepared himself for his confrontation with Esau in three ways: he sent Esau a gift to appease him, he prayed, and he made ready for war."
The above quote provides with good instruction on dealing with those that oppose us. Whether spiritually, in business, or among those who at one time we considered close to us, but now stood in opposition. First, send an act of kindness. Perform some good deed for the one who may oppose you. Treat them the way you would like to be treated. Demonstrate the love of YHWH to them. Second, you should pray. Pray for G-d's blessing on their life and on yours. It is not wrong to pray that you would be blessed. It is not an act of selfishness; it is an act of good sense. Finally, prepare for war. Every one has freedom of choice. We may not always be able to anticipate the choices of others. In all cases, the final act to prepare for war is an act of self preservation. Life is precious, and that includes yours. So prepare for war, and prepare well.
Follow these three suggestions and you will be prepared to deal with all opposition, no matter where it originates.
22 hours ago