Just received a Thermaltake Volcano 7 which is gonna replace a stock cooling fan on my Athlon XP 1900. I'm not using thermal paste at the moment, just the sticky pad that came with the stock fan. How important is it that I hold off on installing my new fan until I buy some paste? I'd really rather not wait but would value opinions on the matter. Also any tips on removing/replacing proc. fans. I do not overclock and don't plan on it either. Thanks in advance!