Is it necessary for a lawyer to be present for a first offense DUI.?

Absolutely, you should consult with an experienced attorney, who would have many questions about the many issues inherent in any DUI matter.  Those questions would address details of the initial stop and detention, whether there was probable cause to justify the officer's request for a breath test, how it was requested, and many other issues.  It would be very unwise to receive the extremely damaging blemish of a DUI conviction on your record and to suffer its consequences without fully investigating and testing the prosecution's case.  Remember, you are presumed to be innocent, and although mere probable cause is required for an arrest, the much higher standard of proof beyond a reasonable doubt is required for a conviction. Regarding your driver license, you do have both the ability to challenge the suspension and to seek a hardship permit.  There are time limitations, however, and these issues would also be addressed during the consultation that you should seek.