3.5 y/o will not go #2 in the potty, any advice?
That's what happens when you start too soon and make too big if an issue. If your child is really ready this should only take a few days.
Don't rely on him to tell you he has to go. Set the timer every hour and when it dings, he needs to go sit on the toilet. Never tell him he HAS to poop or pee. He simply needs to sit there for a minute and see if something happens. If it doesn't, so be it. Set the timer for another hour. Eventually he's going to get fed up with being interrupted all the time. Then you can have a conversation with him about his choices which are: 1) Poop in the toilet on his own; or 2) Sit on the toilet when the timer dings. Some boys are late bloomers in this arena. Don't turn it into a huge struggle. If he's not ready, he's not ready.
Run the water and play relaxing music nature sounds