Front squats are actually safer if you are doing them on your own as if you get in trouble (back starts to curve) you can simply let go and push it forwards (as tweety and bull did in the video), but front squats do take more wrist and shoulder flexibility. The key is to open up the hands to keep the pressure off your wrists and drive your elbows up to lock the bar against your body, keep your chest up and weight centered over the heals. It actually takes more core stability than the back squat because there is a natural tendency for your upper body to want to tilt forward, but concentrating on driving the elbows up helps avoiding this from happening.