I need to change the clutch drum - Echo 30.1CC Chainsaw With a 14 In.bar and Chain

Don't know about your particualr saw, but general instructions are : take the bar cover off, take the bar and chain off, put your piston stop in, remove the clutch nut by unscrewing it clockwise, remove the shoes and springs from inside the drum, and pouit them in the new one, replace it all. If you don't have a piston stop you can pull the starter cord all the way out and stuff some of it into the spark plug hole to stop the piston moving when you turn the clutch nut.

Harbor Freight adjustable pin wrench #36554

You provide no model, this may not be your saw.
http://www.echo-usa.com/pdf/documentation/CS300_100605.pdf
It has an external clutch, this is a good guide for removal.
R² Drive Link Outboard Clutch by Drivelink.blogspot.com
http://www.youtube.com/watch?v=cdqkIuVNUQc

1. Check the IPL for your saw to see if any special tools are needed. Poulan (Craftsman, Jonsered, Husky) clutch removal tool part number 530031112 if needed, is under $5 from many sources (look at the visible area between the weights if 2 small round sockets are visible you need the tool).
2. There are metal piston stops available, when square (almost never) with the piston top these work well, if not square they have been known to punch through the piston. I suggest a length of nylon rope (nothing left behind) be used instead of the piston stop (retain 6" ± so you can remove it). Make sure the piston is near the top of the cylinder before feeding the cord or it can fall through the exhaust port and damage the piston as it rises.
3. Everyone I have ever removed had a left handed thread (tighten it to loosen it).