The first session is assessment. No exposures, nothing you’ve to touch, nothing you’ll be pushed into. A competent ERP clinician spends the opening hour understanding the machine before doing anything to it, and understanding it takes longer than people expect because half of it is invisible.
What you’ll be asked
What the obsessions are — the actual content, in your words. What situations set them off. What you do when they arrive.
Then a much more detailed pass on that last one, and this is the part that’s different from other therapy. What exactly do you do? How many times? Does it have to feel a certain way before you can stop? What happens if you stop early? Do you ask anyone? Do you check anything in your memory? Do you replay it? Do you argue with the thought in your head? Do you avoid anything to prevent it coming up?
Most people discover in that conversation that they have been performing compulsions they never identified as compulsions —asking, researching, thinking it through until it feels resolved. That discovery is usually the most useful thing in the first session.
What you don’t have to say
You don’t have to state the content of a taboo obsession in graphic terms if you can’t yet. You can say “thoughts about harming my child” or even “a harm theme” and a trained clinician will know exactly what you mean and won’t need more for now. They will also not be shocked, and they won’t report you for having a thought.
Being able to say it eventually is part of the treatment, since avoidance of the words is itself a compulsion. But that’s week five, not hour one.
Measures
You will probably be asked to complete something formal — most often the Y-BOCS, a structured severity scale. It’s used to establish a baseline and to track change, and it’s genuinely useful, because progress in ERP is often invisible from inside and a score that has dropped ten points is hard to argue with.
What comes next
Session two or three is usually psychoeducation — how the loop works, why compulsions strengthen it, what ERP does and why — followed by building the hierarchy together. Exposures typically begin in the third or fourth session, starting low on your own list, in the room, with the clinician.
Two things worth doing beforehand
Spend a few days noticing your compulsions rather than trying to stop them. Write them down, including the mental ones. You will arrive with a far better inventory than you can produce from memory in a room.
And decide now that you’re going to say the embarrassing one. The theme you’re most reluctant to disclose is very frequently the main one, and treatment that works around it doesn’t work. Whatever it is, an OCD specialist has heard it many times this month.