I used to have have aphantasia. Now, I can visualize and pre-plan projects and events in my mind's eye. To get started I never did any techniques. Instead, I

I used to have have aphantasia. Now, I can visualize and pre-plan projects and events in my mind's eye. To get started I never did any techniques. Instead, I just listened to fantasy & fiction audiobooks (eg by GRRM and Joe Abercrombie). Once I started seeing scenes in my imagination, I made the connection that "This is just like daydreaming or thinking of memories!" Then I took some training on personal growth which practiced changing the size, color, dimensions, etc and now it's become a powerful tool.