The personal statement should be between 800 and 1000 words long, word processed, font size 12 and double spaced on A4 paper. As long as your statement fulfils the above criteria, it will be acceptable (disregard the maximum page limit on the application form)*. Further to Point 2, it should be devoid of spelling and grammar errors. It should flow well. It should sound good when you read it. You do not want to be remembered as the candidate who couldn't tell the difference between "its" and "it's". Remember, you're applying to teach English to Japanese students. It won't reflect well on you if you don't have adequate command of the English language yourself. Have other people review and edit your essay, preferably trained professionals (like English or Journalism professors). If you don't have professionals, use who you can find. Just make sure that you have this essay as polished as you can make it before you submit.
Below, you will find the two worksheets I used to help students craft strong and original thesis statements and edit their grammar for their essays. When scaffolding and helping students with these worksheets, students were not writing their actual essays. They were simply practicing with examples in the context of the 1920s or other things we studied in class. You will also find an example, introductory paragraph I wrote for a history paper in college. Again, this was to personalize this assignment and prove to my students I had experience with the type of work they were engaging in.
This was a successful Statement of Purpose written by a JET applicant
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The Statement of Purpose is the part of the application which likely plays a huge part in any success. Take your time crafting the best Personal Statement you can. Your SoP should elaborate on the strengths you've brought up in your application, and should refer to the traits JET is looking for. Provide brief anecdotes about experiences you've listed in the application. Show some personality, give the interviewers a reason to remember you. Also, have other people look over your SoP. This is a professional-calibre essay, not something for an intro English class.