a 750 should be able to power up just fine. Try not leaning your body weight on your handlebars... keep your body centered, dont lean forward during the initiation of the power wheelie. If you can try to hug the tank with your knees to get some traction (so your ass wont slide to the back of the bike...). I wouldnt recommend learning to clutch until you are completely comfortable with power wheelies. If you dont have good throttle control and start clutching... its a quick way to go upside down...
