Try this:

Take a hot shower, and stretch all the parts of your body until you feel reaaaally relaxed. Lay down in your bed, or in a recliner, and allow your mind to clear, focusing on your breath. Do this until you feel kind of heavy, like you're falling asleep. Imagine a ringing noise in your mind, and imagine it getting louder and louder and just focus on this ringing until you start to feel vibrations.

BTW, the best time to try to project is in the mornings, your body is already totally relaxed so you can skip a huge part of the process.

For me, the first time I had vibrations and gained astral sight was just waking up one day and just focusing on that ringing. Soon (Meaning less than 2 minutes) I started spinning and BAM huge vibrations spread throughout my body in a matter of seconds. I had astral sight soon after, but I didn't know how to get out. I guess I was just too excited, and this was my first time to try OBE too, it was unbelievable.