Items that you will need:
An engagement ring
A box of your sweetie's favorite chocolates, mine prefers Godiva.
An extra seal sticker for the box.
And of course you will need someone to ask.
Step 1: Buy the box of chocolates.
I say this from experience the rest of this instructable won't go the way you want it to if you get the wrong chocolates.
I prefer to go to the more fancy Chocolatiers where you can customize your chocolates. This way you can get their favorites. Explain to the Chocolatier your idea and they will more than likely be more than happy to accomodate your request. Once I explained it, the clerk at Godiva directed me to the heart shaped pillow and gave me some seal stickers to reseal the box. This will give it the look of an untampered box.