I was really surprised how quickly our pup picked up 'sit' and more importantly how quickly she realized that if she wants something and I ignore her for be behaviour, sitting quietly will get her attention. Bright as a button, Cockers are.
What I find a real challenge now is to get her calm enough to get her to listen to commands - it's impossible trying to teacher her to 'stay', and 'off' when theres something on the sofa table she wants is rather impossible. She is just too hyperactive. Ah well, puppy training class at the beginning of November - a bit late at 16 weeks but I couldn't get her into an earlier one.