This site has two guides on how to get movies but you can use the same ideas presented in these guides to download anime using mirc. Once you get used to it its not difficult at all. Give it a try.

http://site205.webhost4life.com/venomus/help.html

Make sur you clik on the guides that say how to download.

Takes a little while to get used to and you will get kicked out of channels for doing things that are ok in one channel and not in the other. To avoid this its always helpfull to ask for the rules if they are not posted.

Also make sure to download a trial version of mirc client so that you can download anime from IRC!