Well, before you actually start scripting, make it so it resets itself. One that I always do when I am testing something with the Scratch Cat is (this is a basic script)
<when green flag clicked>
<go to x 0 )y 0
<switch to costume[ 1
<forever>
<move( 10 <next costume> )steps>
<if on edge, bounce>
<end>
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