Arduino UNO

I am trying to build a robotic hand for hobby purposes and as a gift for my nephew's birthday but I am having trouble. The trouble I am having is with flex sensors and the servo motors. I am using Arduino UNO to work on this project. My goal is to bend the flex sensors simultaneously and make the sensors move simultaneously. When I flex the first flex sensor, the servo rotates accordingly. However, when I start the second servo, the first servo and the second servo begin acting strange. They start twitching and moving uncontrollably. This is why I need help in doing this project. I will need the schematics, the code, and a video of this project working before completion. I will also need to be guided through the process. The supplies I'm using are Arduino UNO, 5 x Flex Sensors, 5 x Tower Pro MG946R servos, and 9 volt power supply. According to most people this is all I need. I need this project within the next 30 hours. For someone who knows Arduino, this is a simple project.