When you find your speed..and it could be 1 note every 5 seconds if that is what it takes...and go up and down the same scale. Keep it up until you can play the whole scale, up and down, without looking at the fretboard or your fingers. I suggest a daily short routine..10-15 minutes..or longer if it remains enjoyable and you don't mind. If you screw up go back to the beggining of the scale and start it over. I would also only pick one scale to practise, and i wouldn't try to learn a new scale until I had a mastery of the first and could play it at the speed the teachers play. Why confuse yourself with multiple scales? I personally don't move on to the next lesson or scale until I can play it with no messups multiple times and I can improvise.
Playing guitar is supposed to be fun! If your frustration takes away the pleasure of playing, then your efforts are counterproductive. play for a few minutes a few times every day...longer if your feeling it.
I also found it very helpful in the long run, to tune by ear. If you have a tuner use it to verify your ear, or if you are in a hurry and need to rock ASAP! Hear what each note sounds like, hum the note as you tune. I was not blessed with perfect pitch, so i had to develop and train my ear. Tuning by ear is just more training you can do that WILL help in everything from writing songs, or to figuring out how to play a song just by listening to it. I have gotten to the point where I feel the notes as well as hear them. When I tune i almost ignore my ear now because the resonation of the two strings will sync up when in tune. You will get there too, guitar is a lifetime journey not a race.
good luck bud!!
oh yeah...duh..find a playing partner! Having a buddy to jam with will make all the differance...there is nothing in the world as amazing as writing and playing music with others. It is