I pray almost constantly, all day long. Especially during my morning prayer, I ask God to bless my day and let His light shine through me so that I may bless others. I read my Bible daily. So I guess my answer is to immerse myself in prayer and God's word.
When you meet others, ask of yourself how you can answer them and behave towards them in a way that would reflect Christ. Ask in your heart what is the point of servant hood that is required and if relevant. Holy Spirit will lead the way.
As I always say, if you have any thought of good to do towards anyone, then do it, no one looses.
Getting into the word daily, talking with God and worshiping every day, and making sure to fellowship with other believers regularly. These things keep me growing straight, and enable me to interact with the world with His light and His life.
Are there any ways that a well meaning person can hinder their witness, or be less effective when teaching others?
The main way to hinder your own witness and risk people turning from Christ and rejecting the Good News is to fail in walking out the truth before them. However, this is also true, that we cannot devise and carry out surefire plans to lead someone to Christ. Unbelievers are watching us all the time and we will fail. God's plan to reach the unsaved works beyond our human frailties and plans. This I have learned through experience and it was a blessing to come to understand it. The Lord freed me from striving!
Do you think that the Holy Spirit really controls us or is it surrender on our part?
Holy Spirit is hindered in us when we do not surrender! What a wonderful thing it is to witness a fellow believer who is fully yielded to His control! It blesses me and gives me such hope.
Thanks for letting me clarify my thoughts, and not getting mad.
Blessings to you sister Euphemia! You are fully loved!