well you dont always have to practice just do your best at it
you could use your fist. that way you can make it closed mouth, open mouth, tongue, whatever you want to try.
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The mirror or a stuff animal. There are these great lip suckers too. As weird as this sounds, a wad of toilet paper is good.
To make-out as a preteen, you hold you lips together, crossed, for at least 5 seconds. AND you close your eyes. or you just french kiss...