What your therapist is asking of you makes sense to me, since being able to connect your experience to words and feelings is the path to more healing.
For me it took time, months and years to make those connections. I like the ideas given by members above, To add some ideas, you might, imagine seeing yourself in your home, and imagine what the child (that is you), was probably thinking and feeling. Take a playful perspective, and let possibilities come to mind; then speak, write, draw, or cut out magazine pictures, that seem to fit. Unfreezing-that is my word for beginning to relate to my thoughts and feelings, is a process; just keep inviting your thoughts and feelings, non-judging, placing your intention to open to them; and they will come.
You may want to 'set' the right atmosphere; do it with a friend, at a friend's, or in the library. As I would be tense or frightened to explore childhood thoughts and feelings alone, I would use those settings to help me. And, it may even feel like you are guessing or making things up; just keep the exploring going, and trust your process. There is no right or wrong, and you won't get in trouble (a child's belief) for relating to and telling your experien.
And if you aren't ready yet to do the project, let your therapist know. And you don't need to do it all at once. Even being able to approach relating to childhood issues takes a lot: feeling safe enough, is the important piece. Everyone finds it in their own time.
I really like the support the forum is giving you. This is a great topic. It is healing to read. Support your way!