The front axle is not torqued in very tight. I use two allens together (12mm and 6mm ) to get the axle out (too cheap to buy the right tool). The wheel has 2 spacers that are not identical. Better check to see if they pulled your dust caps off to install your wheel backasswards like any moron or stooge with a half-brain would. As far as your bearings running the wheel backwards won't damage the bearings, they aren't directional like the tire. Use your finger and rotate the bearing inner race and as long as it doesn't feel like your spinning gravel in a clothes dryer you're fine. The wheel is a snap in and out since there's no speedo cable to frustrate the bejesus out of you. Pulling the brake calipers is definately required. Remember to pump the front brake lever before you take a test ride. Nothing worse than grabbing a hand full of nothing with the front lever :shock: when you really really want to stop.