There are three fundemental factors that are often responsible for making or breaking a practice session: location, materials, and time allotment. What it all comes down to is where you practice can often be just as important as what you practice. One of the hardest things to overcome are distractions when you're first starting out, and its very important a all costs to do your best to maintain your enthusiasm, and sometimes its just the littlke things that can keep your mind focused, (like listening to your favorite cds beforehand.)
The worst habit that comes to mind, is when you become afraid to go with your instincts. You have to realize that the art of improvisation requires confidence, creativity, and an outmost intuitive grasp for musical flow. Just do your best in preparing yourself for many musical situations, where once you know what really inspires you in forms of music you won't feel the need to hold yourself back.
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"Swoop and soar like the blues angels."
"Swoop and soar like the blues angels."