Well for me it didn't take long, mostly just calling cell phone company, loan providers, work of course, etc. Some places will send you a paper to sign to confirm the name change, others make the change without any problem.
Like I said, it was mostly just a series of tedious phone calls. It depends on how many companies you do business with (credit cards, banks, loans, schools, etc.) that will need to be notified of the change.
VERY IMPORTANT! The legal document showing the change (at least in my experience) is the ONLY ONE MADE!
There is no backup copy; so make copies of it yourself, and do NOT hand that original over under any circumstances! It has the stamp of the official seal and as far as I know, they will not issue another one! So make photocopies to send with name change documents to anyone who requires it! Some may try to ask to see the original, but do not let them have it, if it's lost it can't be replaced.
At least that was my experience. It may vary from state to state. I didn't need a lawyer or an ad in the paper. I called Social Security, they sent the name change documents, I submitted them, got a court date, appeared before the judge, and it was done apart from phone calls and paperwork as I said above. Not difficult, just tedious.
~April