Looking
Looking is one second long. It happens inside whatever you were doing, not instead of it. And it is a search, not a consideration: you go to a place and check what's there, the way you'd check a pocket for keys.
Start with sound. Sound is the easy case, because it so obviously arrives on its own. Something is audible right now. Notice that it was already heard before you did anything — there was no step where you performed hearing. Don't reach toward it. Don't name it. Let it be the thing that's here.
Look for the one it's happening to. Not "consider whether there's a hearer." Look. Where is the one hearing this? Most people find a candidate at once: behind the eyes, in the head, somewhere in the chest. Go to that spot and check what's actually present there.
Take inventory. What you find at the spot is always one of a few things: a sensation (pressure, warmth, tightness), an image (a picture of your own head from the inside, a vague shape), or a word ("me," "I," "here"). Take each one and check it. Is this the hearer — or is this one more thing being experienced, in the same field as the sound? A pressure behind the eyes is felt. A felt thing is not the one feeling it. Check the next one.
Check the edge. Is the sound "over there" and you "in here"? Try to find the line between the hearing and the heard. Where exactly does one stop and the other start?
Stay with what you found. You looked for a thing and found an absence, and the sound is still perfectly clear — clearer, usually. Stay there a moment. Don't let the mind close it with a sentence ("so there's no self"). That sentence is a thought, a new object, and the look is over the moment you take it. Just: looked, nothing there, sound.
That is the entire move. The rest of this page is about not wrecking it.
What goes wrong
Answering instead of looking. This is the one. If you already know there's no self, the mind supplies the answer in a fraction of a second and the search never happens. "There isn't one" is not a finding; it's a retrieval. The only reports that count are things found at the spot: a sensation, an image, a word, or nothing. If you can't say what was at the spot, you didn't look.
Making it a pause. Stop, step out of the day, do the inquiry, come back. That makes looking a mode, and whoever enters and exits the mode is the self again. Keep it inline. Mid-sentence, mid-typing, mid-dishes: glance, and keep going. The doing continues without a doer; that's part of what you're looking at.
Waiting for a feeling. Spaciousness, calm, a shift — any of these may happen, and none of them is the point. If you're checking whether the feeling has arrived yet, that's the self monitoring its results. Drop the check. Look again.
Looking for a long time. The look is one second. Longer is not more. If a second look is wanted, take a second look.
Thought
Sound was the easy case. Thought is the same case, harder. A thought arises exactly the way a sound does — you didn't make it either; it was already there when you noticed it. The question is the same: is there a thinker it's happening to, or just the thought, with an "I" label on it? Look for the thinker the way you looked for the hearer. Find the spot. Inventory what's there. Watch what the thought does under the look — most dissolve — and rest in what's left, without immediately generating a thought about that.
"Getting sucked in" means the label got believed: the thought was taken as something that happened to someone. The look, done in time, is what prevents that. Done late, it's what ends it.
The question that comes up
Mid-look, a question arrives: am I doing this right? how am I looking? what is it that's looking? This feels like a problem to solve before continuing. It isn't. It's the next sound. A thought appeared — so who's asking? Look for the asker the way you looked for the hearer. The question is the self showing up for inspection, which is what you wanted.
What right feels like
A small "huh." You looked where somebody should be, nobody was, and nothing broke. Not bliss; the oddness of it. That faint jolt is the look working. If you get it, don't do anything with it. Close the page.
How often
Many times a day, one second each, inside ordinary activity. Especially when the self is loud: cut off in traffic, an email that lands wrong, waiting for something to happen. Those are the moments it's solid enough to find. A quiet room is where it's easiest to not-find it conceptually, which is the first failure above.
Where it comes from
Ramana Maharshi's self-inquiry (Who am I?), Nisargadatta Maharaj's I Am, the Direct Path of Atmananda and Greg Goode, Douglas Harding's Headless Way experiments, Liberation Unleashed's direct pointing, Angelo DiLullo's inquiry. All of them send you to the spot and have you check.