Getting the platform and the kitchen back
Standing back, gripping harder, moving the knives. Every precaution confirms the fear. Dismantling them is done deliberately, in an order you agree to, never by forcing yourself to the edge.

The precautions feel like sense. You stand well back from the platform edge. You take the route with no bridges. You have stopped being the one who cooks, because of the knives. You do not go into the silent room, the church, the lecture, the ward, because of what you might shout. And you are never alone with the people you might hurt, which means you are never quite alone with the people you love.
I want to write about dismantling the safety apparatus, because it is where the treatment does most of its work.
What the precautions teach
Every time you step back, grip harder, move the object, take the longer route, two things happen. The fear drops, because the danger has been managed. And your brain records: that was dangerous, and I only got through it because I was vigilant. The relief rewards the precaution. The record makes the fear larger.
Over months the record thickens into a case: hundreds of situations survived only by defending against yourself. The brain, reading the case, concludes that you must be genuinely dangerous, because look how much defending it has taken. The list of precautions grows to match. And you have never once found out what happens without them, because you have never been in the situation undefended.
Why forcing yourself does not work
You may have tried. Decided one morning to stand at the edge, or to cook, and found the fear unbearable and retreated, or stayed rigid and monitoring throughout and left feeling worse. Neither is exposure. Retreating at the peak files the same lesson the precaution does. Staying while monitoring is exposure without response prevention, which is the compulsion with a platform under it. Nobody is going to ask you to force yourself onto a platform edge this weekend. That is not what treatment is.
How it is actually done
In CBT with exposure and response prevention, the apparatus is dismantled deliberately, in an order you agree to, at a pace you set. We start by mapping it all, because the list is nearly always longer than people expect: the standing back, the gripping, the objects moved, the routes changed, the rooms avoided, the people never left alone, and the self-monitoring running underneath every one of them.
Then we build a ladder, from something you could do this week with manageable fear up to the thing you want back. Being in the kitchen while someone else cooks. Then chopping something. Then cooking alone. Standing on the platform at a normal distance. Then nearer. Sitting through the silent room. Being alone with your child. Each step is planned together first and paced by you. You are never handed a situation you have not agreed to.
What a step involves
Two halves. The exposure is being in the situation. The response prevention is what does the work: not stepping back, not gripping, not moving the object, and, above all, not monitoring. Letting the thought arrive, what if I did it, and not checking whether you still feel in control. Attention on the world, not on your own restraint.
The fear rises. It peaks. And then, given no precaution to confirm it and no monitoring to feed it, it falls on its own, which is the experience your brain has never had, because you have always defended before it could happen. The feared thing does not occur. Your brain records a different lesson. And the next step is smaller than it looked.
Thoughts and actions
Early on we spend a session on how intrusive urges actually work, because it makes the ladder easier to climb. Thoughts and actions run on different systems. The image of turning the wheel does not move your hands. The horror you feel is evidence that the thought is landing on somebody it is profoundly at odds with, which is precisely why it stuck to you.
What you get back
The platform, the kitchen, the drive, the quiet room, and being alone with the people you love without a guard posted. Part of assessment is separating an intrusive urge you find horrifying from genuinely wanting to harm yourself or someone else; if it is the second, say so straight away and we deal with that first. If it is the first, there is more on how I treat fear of losing control, and the ladder is built from where you are.