ur still good to go. grows on u once u start painting regularly. ^___^
lol. the plastic how-to is a good source too.
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basically:
-sand the part u want to paint with a high-grit paper like, 640 *shrugs*
-if u want a color that'll stand out, primer it first, but if u want subtle color (which i like), a dark primer or just the sanded plastic can do.
-once u get a technique down with spraying (side to side, 6" away from the piece, etc.), u'll get it done in no time. ^___^

...try not to scratch it putting it back on, it's no fun.