A: It's not really a long drawn out process.
What you need: Birth certificate, new name, proof of address.
Where to go: Civil Lawyer
Length of process: Approximately 2-3 months
Your certificates will remain valid, but everywhere you present them, you'll have to present a copy of the Deed Poll.
Also, to change your name on all official documents, you just need to present the Deed Poll along with your birth certificate and apply for your new documents.
I'm happy to see my past COSTAATT Criminal Law students using my site! :-)