Tell you what I think: Your 'dad' (could have been him or a self-aspect, in terms of my answer it's good either way) gave you the rolly eyes because you asked him how to do what you're already doing. He knew it, and/or part of you already knows it.
An astral projection is a projection to the astral plane- and when you're in a dream environment you're already in the astral plane, having a dream experience. The level of lucidity and nature of the experience (self created vs. collectively created) is the difference. If you're lucid enough to ask such questions, you're already in the astral plane, you just haven't moved from the personal experience to the collective experience- which any movement with purpose (such as flying away) will achieve.
Now, turning a lucid dream into an out of body experience is a different animal- because you have to go from being in a dream environment to your body awareness (i.e. wake up a little) and then to move out of body. This is easier than it sounds but it will be a short experience (mostly).
All you do to achieve the OBE from the lucid dream is to think of your body, knowing you're in bed sleeping, feeling the bed under you (or however you sleep). The body awareness will wake you just enough to realize where you are (in your body) and if you don't move and make sure to keep your eyes closed no matter whether you see or not, eventually a separation symptom will happen (with this, usually vibrations for me) and you can do an old fashioned exit technique, of which we have loads of in the OBE R & D subsection.