Personal Trainer?

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I would like to start lifting, but I do not know what I am doing. I can watch dvd's and video's on the internet but am sure I will still be doing things incorrectly at times. I don't want to join a gym because I am too self conscious in front of others. I have a treadmill, home gym machine, kettle bells, resistance bands, and free weights in my home gym ( barbells and dumbbells). Do you think a personal trainer is worth the money? How often do you think it would be of benefit?

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