Examine the skin of your abdomen and back-- they should be free from infection. If you do have a skin infection, the needle used for the procedure may carry microorganisms inside the body and your kidney may get infected this way. Common signs of skin infection are redness, itching, pain, and discharge of pus. An open wound is likely to get infected. You may also need to provide a blood or urine sample to detect if you have an infection. Your doctor will inform you about the whole procedure, along with the risks and benefits of the biopsy. Then you will need to sign the consent form just like with any surgery. Consent is usually required due to the risk of bleeding and infection, or due to the risk for disability or death. Make sure that you understand all risks associated with the procedure before signing the consent form. You need to shave any hair on your back and abdomen. Doing this will make the procedure easier for the surgeon. A clean surface will provide a good view of the target area and will reduce the risk of infection. Take a shower and wash the area thoroughly with soap after you shave. You will want to be as germ free as possible. Most people get anxious before getting a simple injection, let alone having surgery. Anxiolytic drugs such as bromazepam or lorazepam will greatly reduce this fear or anxiety. Take it as prescribed by your doctor. If you do not want to take medication for your anxiety try these other relaxation techniques: Cleansing, deep breaths may help you to relax if you're feeling anxious. Slowly breathe in through your nose and hold for two seconds, then release your breath slowly out of your mouth. Repeat five times. Perform this breathing technique before you go to bed and on the morning of the procedure. Doing some deep breathing will stimulate your parasympathetic nervous system and help you to relax. Meditation is also a way to relieve anxiety. Close your eyes and picture yourself in a peaceful place. Focus for a few minutes and concentrate on slowing your breathing down. This can be done the night before and in the morning before you leave your home. You'll most likely be put on NPO status, which is the medical term for "nothing by mouth" the night before the procedure. It's important for your stomach to be empty to prevent aspiration during the procedure. Aspiration happens when stomach content enters the respiratory tract causing problems such as pneumonia.
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One-sentence summary -- Make sure you don't have an infection. Sign the consent form. Clean and shave the operative area. Take an anxiolytic drug as prescribed by the doctor. Do not eat anything after midnight the night before your procedure.

Hammer-ons and pull-offs are two essential techniques to use if you're soloing on guitar. With a hammer-on, you basically tap the string with your finger on a higher fret to play another note without strumming. A pull-off is the reverse, when you remove a finger on a higher fret so that the string plays a lower note. When done correctly, the 2 notes slur together, creating a smoother sound. And since you don't have to strum each note separately, you can play much faster. Combine the techniques and go back and forth between 2 notes for several beats to create a sort of trill in your solo. This works well at the end of phrases. It's commonly understood that lead guitarists play single notes rather than chords but there's no rule that says you can never play a chord just because you're the lead guitarist. Use chords to add body to root notes in your solo or emphasize a particular phrase. For example, if you used whole notes to build the basic outline of the structure of your solo, you could play some or all of those notes as chords, then fill in with single notes in between. To bend a string, fret it with 2 fingers and pull it across the fingerboard. As the string gets tighter, the pitch will go up. Pull from your wrist to bend the string, using your fingers as levers. This puts less pressure on your fingers and wrist by distributing the effort. Don't try to bend a string if it's not in tune. You could break the string. If you've never bent strings before, it's a technique that will take some practice to get right. Play the note you want to bend, then the note you want to bend the string to. That way you'll know when you've bent it far enough. Vibrato is a technique similar to string bending, except that you gently move the string up and down for a slight variation in pitch. Lock your fretting finger against the neck of your guitar to get a good pivot point, then wobble that finger up and down after strumming the note. Vibrato is more difficult on the outside strings, since you don't want to pull the strings off the side of the neck. Experiment with your vibrato, doing it at different speeds and bending the string at different distances. A small, slow vibrato is typically more appropriate for ballads while bending the string further and faster works well with rock songs. Listen to guitarists you admire and watch their solo technique. If you see something you like, practice it and try to emulate it. The same goes for motifs or riffs that capture your attention. Simply copying others won't make you a great guitarist. Once you've learned how to emulate someone else's idea, play around with it and try to make it your own. All guitarists have influences, but the greatest have a signature style that builds on their influences rather than mimicking them.
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One-sentence summary --
Use hammer-ons and pull-offs to play notes faster. Mix in chords to bring power and drama to your solo. Bend strings at the end of phrases. Use vibrato to add emotion to your solo. Throw in ideas borrowed from other guitarists.