It's very hard to get someone to trust bitcoin if you are just a regular guy. In order for them to trust something it needs to be reflected from you. Like for example if you are crazily rich person right now because of bitcoin and if you preach it to the guys around you the chance for them to trust you will be high because the good side of the bitcoin shows in you. Now if you belong to those that haven't made much $$ out of bitcoin it will be very hard for you to explain and convince them even if you have a high technical knowledge about it.