When you have a stammer, your confidence can take a big hit. Honestly it's going to be a very long road ahead of him if he is going to get over it. I'm 22 now and have had a stammer almost all my life, it was probably worst when I was 12/13. I never went to a therapist, I've just learnt a load of coping mechanisms, some more discreet than others, and now it doesn't bother me as much as it used to. It still takes up a lot of my mind, I do get very nervous before speaking sometimes, but about a year or two ago I stopped becoming horrifically embarrassed when it happened in public, it's just too tiring, if it happens it happens. I think the main thing you can do is help build his confidence, encourage him to do things he's good at and teach him to push himself. I can't imagine it being helpful for you to list off all these coping mechanisms you've heard of and try teach them to him. Putting him on the spot and telling him to speak slower and to bounce on or off certain letters will probably not make him feel any better. For me, every few months I would just recognise a certain situation, word, breath or tightness around my chest and jaw that would present itself right before I stammer. I tried to tackle these one at a time and now, slowing down and focusing on enunciation is actually helpful. Basically your son is going to have to be very self aware in a few years, I wouldn't put too much pressure on him now as an 8 year old to be honest, he has time to grow out of it. If you don't stammer theres one thing you might not know. Your son stammers far more than you know. Other people never fully realise the extent of our stammer, they miss some of the times we try to speak but they get a lot of it. However, people around us miss all of the times we want to speak but feel completely incapable of doing so. It can wear you down and can be very disheartening. Also, you'll probably hear that too much over correction for a child can cause stammering, I'm pretty sure that's a myth so don't worry about that. That's probably the only inaccuracy in 'The Kings Speechs, which otherwise does a great job at portraying the stammer and various coping mechanisms.