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While echoing [USER=35674]@Chris Brown[/USER] that you don't need 1000 words, I think writing that much wouldn't be that difficult. I think it's best to use the word count for the "Why this firm" section. On the other hand, I try to keep "Why commercial law" quite brief no matter the word count. So I'd go with 150-500-350 words for the three sections (why law - why this firm - why me). I think this structure has worked well for me in the past, and it's not difficult to write once you've extensively researched the firm. I actually often really struggle to confine "Why this firm?" to 300 words. Of course, none of this is rigid, just make sure you're really selling yourself and your motivation.