Installation Instructions??

Regarding the installation of the cartridge in a tonearm. Is there a suggestion how to get the tonearm wires on to the pins of the cartrige? Last time I tried, my hand slipped because of a tight fit of the pins, and I broke off the conector on the Valhalla wire of the VPI arm. VPI sent me a new arm much to their credit, but I would not like to do that again. Do you install the wires, and then affix the cartridge into the headshell?? Do you use a special tool,etc. etc.