replacing crank pulley

i just got a unorthodox under drive crank pulley and was wondering if anyone has put one on a spec v. is it hard? i do alot of mechanic work so not much is too hard i was just wondering if you have any pointers or tricks of the trade. i see there isnt much room down there to get a puller on it but i only looked at it from the top.
any help would be apreciated.
thnx
nick