DVDs are a great source. Watch in the comfort of your home (shop is better you can pause, work, watch, pause, work etc.). There are n0 distractions of the motor-mouth types which every class seems to have where the one loud mouth is constantly asking questions 0- designed mainly to illustrate how much he thinks he already knows.
And! A DVD is always cheaper than a class and you can watch the DVD over and over and over. Nothing like having one-on-one instruction for sure, but DVDs are great. I am going to make a 9' concrete couunter top for the lower of our two-tier breakfast/cooking bar. i have had the DVD for a year and laready watched it 3 times. i think I can build the thing right now, but i will wacth it again anyway for a refersher course.