Practicing is gay and it's a waste of time. Actually, let me rephrase that: over-practicing is a gay waste of time. I've been playing guitar for 11 years and I consider lead to be my forte. Now one of the things I've learned from playing all these years is that if you're straining yourself, or your hands are starting to hurt, or you're struggling with your guitar then you're practicing wrong. At this point in my life there's absolutely nothing that I can't learn to play with the most minimal effort. The key is to take it easy. If I encounter a particular lick or phrase that gives me trouble then I pinpoint the exact flaw in my technique where I need work. Then I create a few exercises that focus on this technique. I practice these exercises very sparingly, maybe 10 minutes a day. The rest of the time I work the problem out mentally. I imagine myself playing what I can't play. I picture it in my mind with every precise detail in place. This really works!!! The most famous violin virtuoso of all time, Nicolo Paganini, practiced this way. In fact, he rarely picked up his instrument except to perform!!! The key to playing technical runs and scales is not strength but mind over matter. At the end of the day, however, the fast stuff should only serve as embellishment. What a player should really focus on is composing solos that are structurally sound, lyrical, and expressive. That is what I look for in solos more than anything else (I hate faggots like Yngwie Malmsteen). Basically my point is, don't take scales or technicality so seriously. As long as you do, you will be struggling with your guitar. Heed my zen-like wisdom and you shall not fail.