Learning how to play the guitar is a process of learning how your body works while you gradually put it into increasingly unnatural positions. As you learn to play barre chords you will find yourself wanting to force you fingers into position and at the same time gripping the guitar neck so you can produce a clean sound.
You can make learning barre chords less arduous by relaxing your arm as you finger the chord shapes and seeing how best to place your arm and you hand to grip the guitar with only the necessary amount of force. For some reason many learner guitar players try to place the first finger flat and straight on the fretboard to play barre chords. You will find that if you allow your first finger to move a little in the direction of your thumb so that it is sitting almost on its side, your hand will be more comfortable and you sound cleaner.
Here is a video from justinguitar on getting your barre chords right:
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