I am now on 2 and have got the hang of most of it but still need to come back to some of it. But I have attempted some of the level 1 lessons in country, blues and rock and am finding that I can do them okay. But I will keep on going back to 2 and even 1 until I have perfected it.
The beauty of Guitar Tricks that you can choose. You can go at your own pace and in a way that suits you. There is always plenty of help in the forums if you are struggling with something.