It is no big deal to legally change your name - in fact it is easy as long as there is no intent to defraud. It is important to do the following in the order listed.
1. Go to you motor vehicle department and get your name changed on your driver's license.
2. Take the old and new one to your Social Security Administration office and ask to have your name changed in their records.
3. Make many photo copies of these two documents.
4. Take a set to your bank and get new checks with your new name printed on them.
5. Type up a letter stating you are changing your name and ask that it be changed in their records.
6. Every time you pay a bill enclose a copy of the letter and the two documents.
7. Have your personnel/payroll department make the changes.
8. Include documents with your tax returns (which are driven by your SSN)
You do not have to go to court and you do not need an attorney.