I'm a big fan of Way of the Master. I learned a lot from them and I tried reaching someone by using "THE LAW" first and follow with "GRACE".
It works! They have a lot of free resources on line and many books/tracts and even on on line course. (Of course, the Word is most important).
You just have to do it. Don't worry about how it turns out. Our job is to proclaim the Gospel. The Lord does the rest.
What you may feel was a "failure" today in trying to reach someone could turn out to be a seed that was planted with a great harvest later.
Just get in the habit of always looking for a way to share your faith with those you meet. There will be opportunities everywhere because we are talking to those who are lost every day.
"But I say unto you, that one greater than the temple is here".
Matthew 12:6 (ASV)
"...and behold, a greater than Jonah is here."
Luke 11:32 (ASV)
"...and behold, a greater than Solomon is here."
Luke 11:31 (ASV)