Today when I pratice this morning I felt that something was moving (like scratching) on my crown, is it normal?
Yes it is normal to feel your crown chakra after you have been attuned. Or self attuned I suppose as the title of this thread is "teach yourself"...

I felt alot of activity in my crown chakra after I started reiki, Hawk, so do not worry (just for today)

Lots of practice,lots of water amd lots of meditation are good now.
alley~~*