Most of the Tahoe ski resorts are now open and running, thanks to the early snow dump we've enjoyed. Heavenly, Northstar,Kirkwood, Squaw Valley and Alpine Meadows as well as Mammoth are spinning bull wheels. All it takes is a little wax and some elbow grease. You need to tune your skis or board. Yes, you can do it yourself for a modest investment and elbow grease. If you don't want to get wax on the workroom floor you might want to visit CV Sports at the shopping center on the south side of town. They'll do the job, for prices …