What are some ways you guys have found that are good for achieving preparatory immersion?
Research and meditation usually do
I turn on shamanic drum tracks an hour before my ritual and read mythology and other information from grimoires and such about the entity. I only find that necessary for making first contact.
Study the system and its processes. I like to ingest as mich as i can in the shortest amount of time to maximize the information. Then spend 3 days at least preparing for the rites that i will do.