I believe I am the newest knitter on this site but would like to pass along something I learned.
Don't worry about being perfect. After getting frustrated (down right mad) with my knitting I decided to 'just knit'. Not worrying about what it looked like, or mistakes, I started knitting nothing in particular, leaving mistakes, and changing stitches along the way.
After I finished about 20 rows I went back and looked at what I done.
Then I watched the videos on correcting mistakes and started fixing the problems with what I had done. I figured I had to learn this anyway.
I repeated this until I started being comfortable with the stitches and fixing mistakes.
Although I am still a long way from being what I would call a 'knitter' this helped me get over being frustrated and worrying about everything having to be perfect.