I just finished my rebuild and it is very easy. I used this to help me:
My carb did not come with a tag, but I found that in the front, driver side of the carb, near where it mounts to the manifold. There is a set of numbers that engraved. You can cross reference rebuild kit numbers there. I couldn't figure it out, so I bought several kits and just choose the one I needed. Be careful though if you open the kit most place won't return it.
I just ordered my rebuild kit from o'Reilly, $14.99
You also need a gallon can of carb dip and carb cleaner spray. Both at O'reilly. The carb dip works wonders, mine looks brand after an overnight bath.