It would be great if you could choose to have a greeter show you the ropes up until say you finish level 2, even if you first declined the offer. When I first started playing, I declined a greeter because something was going on in RL that meant I had to leave the computer for a while. I think I probably ended up asking a lot more questions in the Live Help Chat as a result - they were fabulous. I was very lucky and met some wonderful glitches along the way who led me in the right direction and even gave me items to help me. However, I think for new glitches it might be an idea to have the option for a greeter open for a certain number of levels or an amount of play time, if it wasn't taken up at first. Especially for the not so obvious things you can do in the glitch world such as 'Activate' spinach to jump higher or to be careful not to 'Sing to' butterflies too much as it eats up your energy.
I love the glitch community and love trying to help other glitches and I hope that the friendly community spirit doesn't change too much when the game launches. The greeters program is a fabulous addition to the game which, I believe, would be even more helpful if it was accessible for a little longer.