While I can't help with chakras, I may be able to help you with meditation. :)
The technique that's worked for me is simply breathing. Breath in for 3 counts, hold for 2, breathe out for 3 counts. The only thing you pay attention to is the breathing. I find it easier to focus when I have something to 'do'. Start in small increments, then work up to 3, five then ten minutes :)
If you have issues with breathing, with your thoughts bouncing around like caffeine laced puppies in your head, I simply sit back for a few minutes and watch the thoughts bounce around. No acknowledging the thoughts, no thinking about them...just let them bounce around. It takes a little longer to focus, but it helps me a lot.
Good luck to you!