As a beginner, you should definately use a kisser button. It's easy to find your anchor when you practice in the back yard, but if you're in a tree stand in a real hunting situation, the last thing you want to be thinking too much about is your anchor point.

I usea kisser button, make sure the string is in the center of my nose and my blazers are just barely touching the side of my chin.

I started out with a kisser button, last year I went without, and this year I'm back to it. 3 or 4 fps is a small price to pay for not having to think about my anchor. Many people, like Sooner State Hunter and NCRemington700,are just as comfortable w/o a kisser. The most important thing is that you can find the same anchor everytime and find it quickly.