there is alot of disinformation on remote viewing and astral projection, which are actually based on the same practice used on different targets.
practice feeling and knowing every part of your body gradually, in order to feel for the etheric body, some eastern traditions can be a boon in this practice, this will take around 6 months. must start small, and only add to this practice, not replace.
construct a simulacrum of the etheric body by will and observance, practice daily, place in different places and positions, make it move realistically. depending on visual training of individual, this will take 1 month to a year.
project consciousness into etheric body, make a simple route with different sense to guide yourself by, so place symbols you are familiar with, scented wood, different textured cloths, learn to sense through the etheric body as you maneuveur it through your designated route. training the senses of your etheric body and keeping a sharp memory of your projections will take time, widely variable by person. training in lucid dreaming can be of use here.
this is where remote viewing and atral projection diverge, remote viewing will use this training to move through space, you can learn to fly or teleport within your etheric body, while astral projection will have you move into symbols, starting with the 4 fundamental elements, making gates out of their representation to move through.
then moving onto hybrids and much, much more.
with enough discipline, this method will bear fruit for anyone. if there are tricks to achieve these results sooner, i do not know them. I hope I have been of help, trust your intuition when doing research, this type of information has become harder to find in the last few years.
good luck anons.