Hello,
- You could practice the detecting technique by imagining a friend in front of you. This is essentially long distance healing, a higher level detection ability, but something you can certainly work with. The process is the same. You work with holding a focus and visualization in a very beneficial way. You get into a focused state that becomes more and more familiar, and this state is the same, whether close to someone or far away. It is also a good practice to leave doubt out of, building confidence. Be receptive, and have no expectations.
You can feel energy , sense energy with your hands. You can take the time here and there to feel a plant, or an animal,,just feel energy in things around you. A general tuning in to feeling the energy of things is good. A real person will show up here and there...opportunities will come up.! You could supplant the words 'detecting, or scanning', with 'feeling' the energy of something, or reading the energy of something.

- eyes open or closed is okay. They are probably open for the most part, but you are really looking inward to feeling as you work. Sometimes you might just stop, some inspiration relative to the area you are working on, close your eyes and reach or touch deeper into 'something'. There is no set rule here. If you really focus on what you are doing, how your eyes function, will naturally align with or follow that focus without thinking about it.

- When you run someone's small universe three times, you are projecting your qi/intention to move your friends qi. Your friend may feel your qi, or possibly qi move in them as a result of what you are doing, or, you may be encouraging their qi to move through an area. If you want to check on her heart, or her stomach, relative to possible blockages, you approach that through scanning and detecting, 'a subsequent process', or separate undertaking. All this is very clear, purposeful progression towards healing and clearing, without extra thinking or concern around it.
It is very easy to read your post. Your English is good.!
Good healings to you,
love, Gallen