Easiest way would be the following:
Download CGMiner (or Reaper, I haven't had luck with it, though):
http://ck.kolivas.org/apps/cgminer/Sign up for a Feathercoin pool and make a "worker" in your account there, there's many pools to choose from... Quick List:
Make a text file with a .bat extension (name whatever you want) in the CGMiner folder. In, put something like this:
cgminer --scrypt -o PoolAddress -u workerName -p workerPassword
Then just run the .bat file, it should work. You can fine tune it if you'd like.
Example, I'm on the fhc. ub3rl33t .com/ pool, so I'd use this command:
cgminer --scrypt -o stratum+tcp://fhc.ub3rl3[Suspicious link removed]m:3334 -u TheSpiral.1 -p x
The URL should be on the pool page itself.