It turned out to be a recording of moos and clanking cowbells. I laughed too much to have a successful dreamtime. You will probably want to play with this aspect too, until you figure out what works. Also get together any blankets, pillows, or mats that you want to use. Having a cleansing bath or shower before journeying is useful, but not necessary.
Bathing is relaxing and helps to make the transition from the mundane world to the spiritual one.
Using such herbs or oils as Lavender, Lemon Balm, Chamomile or Sandalwood helps to relax the mind. Use cheesecloth satchels to keep the drain from getting clogged with loose herbs. While in the bath think about what you want to accomplish on your journey, what questions you want to ask, if any. Try not to think about your outer life too much. Quiet your mind and relax.