Try practising with the half deck because it helps you to rotate the packet around, once achieved, try using with a full deck. About the backhand spread, try to go slow.
It seems that Theory11 changed your life and your perspective, it's good to see you as a changed person and hopefully to keep it that way in the future as well.
It brings out wonder and smile off of the people which I do magic to people rather than gaining popularity. Reason is, you are abusing magic just to gain popularity.
I responded the same statement as you did. If I told them that I learned from youtube (pretend that it is), people would go to the internet which would ruin the magic.
Are you a drug addict? LOL, however, there are some tips for you to work on, I get a little bored for this and the shots are repeating itself. Try not to make the video long.
Listen to your favourite music and it will give you the "confidence" level and the energy. Just try going over the moves very slowly for your fingers to know the coordination and eventually, it will speed up. Try not to overpractise. I wish you luck.