Don't take it as a habit to skip tasks. It will hurt your learning. After creating your gravatar you will certainly love it.

I would just sign up for gravatar right now. It's a good idea because then every comment you make from here on will show your avatar picture, your name, and this is good if you're going to build a brand with your blog as it exposes your name and picture to other readers who may be reading blogs under a similar niche to yours.