I think the main thing about setting a clicker for the first time is to make sure it isn't too far forwards of the button. If it clicks before you get the string to your face it can make problems. Draw with confidence and set it so that it doesn't go off while you settle into your anchor points.
Then, I think it is a good idea to stand close to a boss and just draw to your anchor with confidence. Don't bother about how close you are to the clicker, just imagine it is another inch to go. Then draw some more and it will click. Once you have found it isn't going too early( before you get string to face and settled) then pull till it clicks.... and keep on pulling to prove that you can pull even further if you want to. You could call that "pulling to 1cm past the clicker."
So, as an exercise you are pulling to your anchor and settling ( not stopping) and pull through the clicker and keep going past it.You might imagine that you draw another 1cm after it clicks. It doesn't matter if the distance isn't 1 cm. It is more important to know that you can pull right past the clicker.
In real shooting you can imagine that you draw to anchor and settle on aim, and draw further and your fingers fall off the string before they reach that "! cm past the clicker. The fingers fall off the string as the clicker goes, and because you expect to pull another 1cm, you get a nice follow through.
It's like pulling Christmas crackers; you don't stop pulling if it hasn't snapped. You are still pulling harder when it snaps and the two parts fly apart just like a follow through.