I suggest as a start, walking, as I often have done... First of all, just enjoy being alive and walking in nature, that's so beautiful, and think what a joy it is and forget all your heartaches. And of course, you can think of different things like for example, isn't it extraordinary that at night time my glance can reach into the stars, millions of light years away. So it's just that, so that would be the first level at which one thinks that one is the witness, that word is Shahid.
Now the next stage is that while you walk you get into, you imagine, you transfer your consciousness into the trees, for example, and imagine what it's like to be a tree. Or the mosquitos. Instead of complaining about them, just think how courageous they are to bite you. Now you really get into their consciousness. They've got to earn a living somehow.
So eventually your consciousness really gets into, it is able to shift its center into what was the object. And what the Sufis say is, I see him/her through his/her eyes. And it's of course a very wonderful thing because from the time that you do that, you can get into the consciousness of wonderful people. You can get into the consciousness of masters. And you can get into the consciousness of the people who have done you harm. And you can see that their perception of you is not the same as your perception of yourself. Which would explain why they did what they did.
That was the state of St. Francis walking in the woods. I walked in those woods in Assisi and I'd get in the consciousness of St. Francis. The ecstasy of it, it's incredible when you are able to free yourself from your vantage point. Instead of thinking of that tree as something you are looking at, the tree is looking at you. It's a total experience. So why don't you do that under the tree?