Yes, I think I see this pretty clearly. When I'm doing an exercise like arm raising, I see that everything is automatic, the only difference being whether or not the thoughts of being in control are there.
When I'm not doing the exercise though, I tend not to see this, I tend to assume the existence of a self, because I'm more used to that way of thinking. The no-self way of being is not intuitive to me, so it takes effort to see things that way, even though it becomes clear when I focus.
Ok good. So, you need to spend time throughout the day, whenever you remember, looking at any and all activities that happen, and see if you are doing them, or if they are all on automatic. Talking, walking, eating, cooking, writing, typing, whatever. Look whenever you can, and see if you can spot the "I" thoughts that go along with the action. Are they you? Are they the thing thats giving control?
Which brings up another question. Are you your thoughts? Are you doing your thoughts? or are they automatic, like everything else? When you look, can you find the thinker of thoughts? Do thoughts seem to just rise up and fall away? Can you predict your next thought? Do random thoughts sometimes pop into your head and you go "where did that come from?"
As well as looking at actions, look at thoughts throughout the day, whenever you remember. Its ok if you get lost in them, whenever you notice it, just start looking again.
Remember, there is no you doing this, so all your old thinking patterns, all your old habits, are still there, still on automatic. The organism is now training itself to see through the conditioning, to notice things that it didnt notice before because it was full of assumptions and beliefs. So dont get discouraged if you arent always seeing things clearly. You can even use the discouraged feelings to look , to see if there is anyone doing the feelings, to see if there is anyone feeling the feelings, or if they are just there, whether "you" like it or not.
When I do this exercise, sometimes I get a euphoric feeling, similar to the "bliss" state I get into while doing meditation. I become more relaxed and start to have less thoughts about what I'm doing. Sort of like switching from a video game to a movie, which involves less interaction.
Regarding the "experiencer", I'm not sure what to say.. it seems as if I haven't gotten anywhere on this, i.e. intellectual understanding but no insight.
Yes, its tricky, and an easy trap to fall into, we can set it aside for now and just concentrate on looking at actions and thoughts