Here is a man who has a little bit of aversion towards "asking Jesus into someone's heart":
Please Come to Christ (Paul Washer) - YouTube
Paul Washer once said that the first time he went out into the street to share the Gospel, he just stood there with the Bible in his hand, terrified and with no idea what to say. He was like that until people started coming up to him and asking, 'Why are you standing there doing nothing?'
He also says that usually when he is flying somewhere, he takes out his Bible to read and puts it in front of him to maybe interest his neighbour. If he doesn't, somewhere along the middle of the flight he will turn to them and say, 'Hello. My name is Paul Washer, and I am a Christian. May I ask for five minutes of your time to share the Gospel with you?' And if the person disagrees, he drops the subject and talks to them about anything else, so that they could not say afterwards that a crazy evangelist latched on to them during the flight.
He once said that a neighbour saw that he was reading the Bible and asked him, 'Hey, how do you go to Heaven?' To which he replied, 'Oh, it's simple. You just have to be a morally perfect person from the time of your birth until the day you die', and turned back to his Bible. The man just sat there for a while, astonished. Then he spoke to him again and asked, 'Well, what if I'm not?', to which he replied 'Then you've got a problem. Have a nice day.'
I don't fly very often, and the only time I did since I was convinced I need to share the good news, I was sitting next to a young man and woman who just met and were flirting the whole flight. I never said anything to them.
I have a problem with witnessing. I am not a very shy person, I am confident in my theology, but when it comes to witnessing, I am speechless. Even at my job, people know that I am a Christian, I pinned up church organ concert invitations on the pin board once, and that's it.