Your motive is the most important part. Keep in mind that you are not proselytizing to increase the number of people on "our side" or racking up brownie points that will get you into heaven. You have something that can help them, and you want to share it because they need it.
Also keep in mind that most people will not want it as long as they are happy with their current lifestyles. A player doesn't want to give up playing, and trying to tell him why he should won't do any good. Most people will not be ready to listen until they are fed up with their current lifestyles and realize they need something better.
Above all stay prayed up and listening to God. He knows a lot better than you when somebody is fed up and looking for a change.