I try not to doubt anyone that I meet, however when they tell me things about themselves I trust that they are right.
I trust that they would not lie about who they are.
I met a guy last year who claimed to be an Heating and A/C specialist; He said he fixes Heating and A/C systems for people all of the time but it is not his full time job. It is just something he learned to do along the way. I was excited because I was having some problems with my control device I was hoping he could fix. I invited him over to do this for me and I paid him of course. I was legitimately grateful for his services rather than paying much more to an actual Heating and A/C worker, then a few days later the control device stopped toiling again and I could not get ahold of the guy who I had met. I thought that maybe the took my money and ditched. I called for an Heating and A/C specialist to come look at it since I had no other option. He looked at the control device and observed that someone had tried to play with it and he undoubtedly broke it more, but the whole control device would need to be updated now. I was so mad at this whole situation; Needless to say I am much more cautious about the people I meet. I suppose it is a lesson to always leave the problems to the Heating and A/C specialists since it is their job after all; Bad things can come from letting others touch your Heating and A/C equipment.