Hello Slarocco,
When I started SFQ I could not stand at all. (Arthritis in every joint and a recent operation on foot to remove arthritic joints).
It is perfectly OK to lie down, both for the active exercises and the meditations. I did, and it took me 3 months to achieve the standing and sitting positions. That happened because SFQ actually got rid of all the arthritic pain in my body. 4+ years later I am still pain free and have never had to take any painkillers ever!
Incidentally I still sometimes do Small Universe lying down in bed at night!
Only do what you can manage without pain or stress. If you have to lie down or sit down - do so. The Universal Energy is intelligent. It will come to you if you ask and will also go to where it is needed. If you want to see QI, ASK to see , look towards a shady corner of your room , preferably with a pale neutral background,just relax, go soft, and let it come to you. Don't reach out - trying too hard defeats the object - it will come. You will start to see little bits like snow or tiny squiggles in the air. They may be whiteish, silvery blue, or sometimes coloured. That is QI.
You don't have to do all the exercises, just do what you can manage comfortably. Eventually you will be able to do them all when you are ready. It is more about mindset and belief and having that 'knowing' that the Energy will do everything for your 'Highest Good'. Give yourself permission to let it happen. Relax and enjoy the experience.
Love and light
Faune