The key to solid meditation is breathing rhythmically while keeping your eyes and hands still, focused on one point.
Chapter 8 and 9 in William Walker Atkinson’s book The Hindu-Yogi Science Of Breath explains how to do a complete breath. You may want to just sit for a few days and work on rhythmic breathing for half an hour daily to get this down. You want to have rhythmic breathing down to where it’s almost automatic.
For focus, draw a black dot of 1cm diameter in the middle of the page. Focus on keeping your eyes on the dot while you sit up straight and breathe rhythmically. Keep your eyes on the dot no matter what. Do that for a few days until you get it down.
It should take you around 3 weeks to get to where you can sit for half an hour and stare at the dot while breathing evenly.
At that point, use a black mirror in place of the dot. We make this work so complicated when it can be simple. If you don’t have a black mirror, turn off your smartphone and use the screen.
Black mirror skrying will deepen your meditation practice, can be used to develop your clairvoyant vision, and is a handy astral mirror for spirit contact, so it serves multiple duty to build your breathing and focus to properly use this tool.