I usually trust my own instincts and if something is important will do my own research before swallowing anything someone else says. I have never really cared about fashion stuff, so just go my own way with that, but things that affect us all like climate changes, or flooding in our area, I will try to find out facts, rather than listen to some politician or builder who have their own axes to grind, and whatever they say needs to be taken with a large pinch of salt.
As to friends, at my age I am happy and grateful to have very dear friends that I have known for more than 50 years , and trust them, so would pay attention to anything they thought was important, but that does not say I will follow anyone like a sheep. I can be totally wrong but my mind is my own and what I do in the end will be what seems right to me, and not what anyone else pushs me to follow. When you look at who is friends with who, it can give you some good ideas as to who to trust. So Farage, and his sent to jail buddy and Donald Trump. Wouldnt trust any of them as far as I could throw them. Thought that for a long time and feel that I had got the measure of them, but of course it could just be that I pick up on the things that confirm my own feelings. Still worth being trusting with new people , unless they let you down. I would hate to be permanently distrusting everyone as a basis.