My breakthrough began with the images that cross your eyes as you are falling asleep. I had my eyes closed, but I could still see the light out the window and the shape of the window in my room. So then I raised my hand, I could see my hand through my closed lids! This was after having a mild herbal thing (no solanaceae) that got me into a more sustained trance. So I went out the window, since I could see it, and I walked down my street, only a block, but it was awesome. If you close your eyes and see anything as you are falling asleep, even just white static, focus in on it, see if it forms into something/someone/a landscape and follow it. I am really nearsighted in the otherworld, I can’t see very far. This is how I did it, I didn’t take a lot of precautions, you might want to do more than I did.
I also did this with a candle flickering on the table in front of my closed eyes. Eventually I started seeing faces and stuff, and the pattern put me into a trance and I could go to the otherwordly temple that my teacher had set up for us. You don’t have to have a teacher with a temple like that, most witch books have some sort of place like that described in it that you can go to and begin your travelling from.