I recently did a huge pile of BRD stamps myself. I used a technique similar to Dianne's but not as sophisticated.
Many BRD stamps have the date on them so they are easy.
I took a number of #6 envelopes (not recommended for long term storage)and started filing them by date of issue and some other rough classification that makes sense to me (castles, portraits, misc.)
As you progress, some definitive issues will become apparent (I don't know how familiar you are with BRD stamps. You may already know the definitive series) You can start a separate envelope for them. This leaves you with more manageable piles.
Then it's time to hit the catalog. I take an envelope and begin cataloging and putting them in their semi-permanent resting place, stock book, glassines, etc. by the appropriate catalog number.
This process works for me. It makes the piles less overwhelming and the cataloging doesn't require as much flipping around.
It's not perfect but working on one envelope at a time gives me a sense of progress.
Hope that helps,
Dan
