Changing an attribute field in several thousand blocks...ARRGH!

[Anonymous]

I have a few thousand blocks that I have to make the exact same change to and then put onto tool palettes.  These blocks have an attribute in them that is supposed to match the name of the block for data extraction purposes later on.  The person who initially made the blocks didn't bother to enter the indivdual attribute field correctly the first time around (just entered "X")...hence the large, repetitive, boring task ahead of me.

It took me several days to figure out a procedure to make this work.  I've attached the procedure I'm following; I think there are too many steps in here.  Could someone please look this over and tell me how I can make this task shorter/easier?  Thanks in advance!

[VinodBalasubramanian]

Yours look good to me. You may want to take a look at the link below too,

http://forums.autodesk.com/t5/autocad-2010-2011-2012/bulk-editing-attributes-in-multiple-blocks/td-p...