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Launch Quicktime Pro. Click File/Open File...                              

Navigate to the file you want to edit                        

  

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Set your IN and OUT points

Use the keyboard shortcuts i = IN   /   o = OUT Image Modified

Move the playhead to where you want the clip
to start. Press "i" on your keyboard.  Then move
the playhead to where you want the clip to end. Press "o" on your keyboard.

 Frame by Frame accurate editing

You can move the playhead frame by frame to get a very accurate 
edit by using the arrows on your keyboard. Use the arrows keys to 
"fine tune" your edit.

Now

Copy the clip Section Now that you have set the IN and OUT points for your clip you now

need to simply copy the section, open a new Quicktime player, and paste
the new clip section into the new player. 

Click Edit/Copy - this will copy the new section to the clipboard

Open a new Quicktime Player

Click File/New player - this will open a new untitled Quicktime player

Paste the clip section

Click Edit/Paste - this will paste the new clip section into the new player.

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