I think you will find most folks here will recommend a bolt tool to remove the extractor and plunger. I personally would not attempt it without the tool.
The pic came from Fulton Armory http://www.fulton-armory.com/MCarbParts.htm
Attachment 10987
You might find this site helpful with disassembling/assembling the bolt.
http://www.surplusrifle.com/m1carbin...mbly/index.asp