just send an email to visa consular section in Kathmandu saying that you are coming for visa stamping and ask them to verify PIMS. do this few weeks prior before traveling to Nepal
They will reply within a week saying your data has been updated.
There is nothing more you have to do.
Not sure why lawyer is asking money for this.
also, PIMS verification is not mandatory.
Below is there response after sending email...
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From: Consular, Mailbox (ConsKTM) [mailto:ConsKtm@state.gov]
Sent: Tuesday, January 26, 2010 10:20 PM
To: XXXXXXXXXXXXXX
Subject: RE: H1-B Visa Stamping

Dear Mr. XXXXXXXXXXXXXXXXXXXXXXXXXX
Thank you for your email and the I-797 you provided. We have verified your record in the PIMS; you are good to apply at Nabil Bank. Unfortunately, we do not accept on-line or over-the-phone application. Currently, our wait-time for an interview appointment is about 2 days.

We suggest that you to apply for an appointment as early as possible, and if you have any problems with the schedule given by Nabil Bank, please email us and we will be happy to assist.

Best regards,

Consular Section
U.S. Embassy
Kathmandu, Nepal
Phone: 977-1-400-7200
Fax: 977-1-400-7281
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