actually I think if you are unsure what you are doing you need to take it to a professional or find a friend who actually knows what he is doing to teach you.
there are great videos on the park tool website to checkout too
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“One morning you wake up, the girl is gone, the bikes are gone, all that's left behind is a pair of old tires and a tube of tubular glue, all squeezed out"
Sugar "Kane" Kowalczyk