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Seriously guys, there is no magic way to get better at this game, there is no cheat codes that will grant you Satriani skill. The only way to hit the right fret, the right string and any of the other techniques involved in playing a real guitar is to practice a lot.
The only tips I can give you is to practice without the game first. Just sit with your guitar unpluged and do some practice. In your case strum your strings one by one from 6 to 1 and from 1 to 6. When you start feeling more confident, try doing some patterns like 6-4 5-3 4-2 3-1. The point here is not trying to actually play music but to make you feel more natural with your guitar in hands. Playing guitar is no different than when you learned to walk, learned to write or learned anything in your life.
One last thing, this game is not a guitar hero/rockband games...