For the headlamps, it's child's play - you just open the bonnet, pop open the black plastic door on the back of the lamps and there the bulbs are.
Fogs and sides are bit harder as you have to put the steering on full lock, unscrew some plates in the wheel arch and reach through to the bulbs, so it's going to be a cold/grubby job at this time of year.
And you know these aren't "Xenon HIDs", don't you? They are just regular halogen bulbs with a blue tint and may not even give as much light as the standard ones. But if all you want is to change the colour of the lights, and you're not fussed if they light up the road well, they'll do.