Okay... Not wanting to re-invent the wheel, here is a good write up and overview on uncasing a 6497 from a Panerai case by Ziggy:
http://www.rwg.cc/members/index.php?showtopic=1416
So, to start this project, simply follow Ziggy's excellent step by step tutorial to remove the movement and dial assembly NOTE: Rob states to release the stem in the winding position; I personally release mine in the time setting position (and have done so with no problems thus far), but who am I to argue with the Robster? The man knows his movements!
Anyhow...
Once the assembly is removed from the case, secure the movement in a movement holder, and start by removing the hands.
You can use a specific tool made just for hand removal; I myself use two very small 1.0mm screwdrivers with a bit of tape wrapped around the tip to prevent scratching. Gently slide the blade under the hands and very, very gently work the hands off the pinions. Since this movement is hour and minute only, there's no need to preset the time to 12:00 or anything for a baseline on the date changeover; it simply aint there
Next, remove the dial. There are two very small lock screws right next to where the movement clamps secure to the movement.
If you look very closely, one edge of the screw head is flat; what you'll want to do is line the flat edge up with the dial feet. Once both screw heads are aligned as such, the dial is ready to come off, and should lift free. Once the dial is off, simply replace it with the new dial and lock the dial feet back in with the lock screws. Flip the movement back over and it's time to set the hands back on. Personally, I like to go the low buck route with hand pressing tools- I use an empty BIC pen tube, which has done the job well and without any scratches. You can opt for a specialized tool; whichever method you feel the most comfortable with is what I recommend For best results and ideal alignment, set the hands at 12:00. This provides a good basis for proper hand alignment around the dial and also allows you the chance to look at the hands from the side to make sure that the hands are not coming into contact with each other, or the dial. Once confirmed that all is clearing properly, the watch is ready to be re-cased. Rob has provided the procedure for this as well in the link above. Once the watch is re-cased, and the stem is reinstalled, I recommend pulling the crown out to the time setting position, and giving the hands a full revolution around the dial to make sure that there are no issues with the hands contacting each other.
And, there you have it. Sorry the pictures are all poor quality (and relatively old). Perhaps, if time allows this weekend, I will take one of my watches apart for some updated pics of the procedure.
Hope this helps!!
Best,
Randy