Hi Gillianna, yes I know a bit of feng shui. I got into it about 7 years ago, and read loads of books, really studied it at the time (though I am quite rusty now), and 'did' the room of the flat I rented then. Before long I bought my first flat and 'did' it- I really took the -different colours for different compass directions- to heart, and had a very brightly coloured flat.
I have moved twice since then, and have feng shui-ed each property since, though in more subtle ways- with the placement of objects, plants etc- not the abundance of bright colours.
I also (probably more importantly) keep in mind the 'best direction' part of it, where dependent on your kua number (off the top of my head I can't remember how you work out your number, I think it is to do with your d.o.b.) you have certain compass directions that help you, and some that hinder.
My best direction is west, so it suits me to face west when I study, or sit in a room, or sleep, it is beneficial to me if my front door faces westwards etc etc. With each house move, since I got into feng shui, I have taken my best direction and my husbands best direction into account before making a move.
Feng shui has certainly made me tidier, and quite minimalist in the home if nothing else, as it lauds a calm, well ordered environment. I also credit it for my calm and contented life. It may be a coincidence, but when I got into it (I was in my mid 20s and a student, which can be a chaotic time) my life was pretty disorganised (not bad, but full of ups and downs), since feng shui-ing, my life has gotten better and better with every passing year. I would certainly recommend it.
Do you sleep, facing a certain way in one room and not in the other? Also, if you feel you sleep better in your guest room, perhaps you should swap rooms.
Lillian Too has written some very user friendly Feng Shui books, so I would start there.