I'm new to the VX, however I've found with my other cars, that when I changed the plugs, I would do this:
1) Start when the engine is completely cold (Get all setup).
2) Run it for about 1 minute.
3) Hurry up and remove the plugs using a ratchet & plug socket (regular socket will work, but the rubber insert in a plug socket helps keep things straight so you don't break a plug).

I'm sure others will chime in if I'm out of line for the VX.