Spend days and hours learning.
Keep prayer at the forefront.
Remembering that you won’t convert a soul but that the Holy Spirit does it, give Him the best opportunity. Often what wins people over is not the perfect answer or your surety in your faith, but rather the WAY in which you reach out to them.
I often tell people to be inviting rather than telling people they should go to Church. On the radio the other day I heard this, which gets to the point of what I am trying to say, “Often people don’t remember what you said as much as they remember how you said it.” No matter how right you may be, if the person bristles when you say it, it won’t soak into the brain – or if it does, it will do so as a poison rather than a medicine.