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I did my O-1 visa with a lawyer, but he was not very helpful in advising me how to write these letters. So I talked to my friends who did the same thing and I wrote those letters by myself. It is hard for a lawyer to know all details of your carrier. Basically you need as many letters as you can get from people that you worked with. The best is to get people from different institutions. The letters should in the first part summarize the qualification of the person writing the letter. This paragraph should end with the statement that the writer is an expert in this field. The next part of the letter should describe all your achievements, including your education, any awards, prizes, publications, memberships in organizations. It should describe your person in superior wordings, you have to overcome any shyness and describe your achievements in the most positive picture. I had about 8 letters, including the peer group letter from a group of physicians working in the same field and from your employer who has to describe how they can use your skills. It takes quite a while to gather all these letters together. You have to submit all the evidence together with the letters. Then you need to fill out appropriate forms (which my lawyer did) and fees and send it to INS.