Excess paper is the smokers worst nightmare, not only do joints taste horrible with loads of paper but it isn't healthy for you either. One way of getting rid of excess paper is to tear about 1/3 of the paper off the bottom of the skins. Also if you are rolling a L skin you don't need all thet paper stuck on the end, so tear off around half of it.

The best way of tearing the skins is to first crease the paper where you want to rip it. Then lick along the line and the you should be able to pull of the excess paper with ease.

If how ever you decide to roll a slanted L skin have a look at the following animation

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