Get a SVN client, preferbaly tortoise svn (http://tortoisesvn.tigris.org/) then after downloading the client, make a folder on your desktop called wiremodCO (for wiremod) or PHX for phx. After you've done that, you have to find the SVN link for both of the mods. For wiremod, it's http://wiremod.svn.sourceforge.net/svnroot/wiremod/trunkFor PHX, it's https://phoenix-storms.svn.sourceforge.net/svnroot/phoenix-storms. Right click the folder and click svn checkout for the specifed folder, then put in the links according to which addon you're installing. Then extract everything like you would as an addon, and you're set! If the WIREMOD svn doesn't work, follow this guide (http://www.wiremod.com/forum/technical-support/4-wiremod-svn-guide.html)
He's offline right now :(
I might join this server when Gmod finishes downloading.