I always find the Blowing Up technique (that's what I've labeled it) lol works quite good. Using your breath as you exhale out imagine your Astral body blowing up like a ballon and as you inhale imagine the ballon (your Astral body) floating up, if that makes sense? Keep going and see yourself floating up to the ceiling and out through the roof of your house and up into the sky, keep going until you're out.