Faith by George Michael - First vocal sing along

This song I find is very challenging in most vocal areas, the song gets quite high so I need to make sure I am supporting from my diaphragm properly so I don't strain. Also, what I noticed that there are variations in dynamics and tones throughout: he starts it quite quietly and almost like whispering but with a bit more audibility - in other words it is a very soft tone, which I found quite hard because of the nature of my voice and I find it vey hard to sing this way whilst still supporting properly because when I use my diaphragm to push the air out I naturally produce a stronger tone which is loud. Furthermore, I noticed that there are a lot of transitions between the soft tones and stronger tones going back and forth many a time throughout the song, and I find this hard switching from stronger tones to the softer tones. In terms of breath control and stamina, this song isn't that bad compared to Jesus of suburbia, but it still is quite demanding in stamina. To make sure I overcome this I need to make sure I fill my lungs with as much air as possible and then when I push it out, I am being efficient wit the air and not pushing to much out but at the same time make sure I push out the correct amount needed.