i think it is a straight swap. You might have to wire up to the existing sidelights. This is really easy though.
hey, i have the black mk2 angel eyes!
basically, remove the front bumper, and then unbolt and unplug the headlights and then do the opposite to install them! there will be a spare plug coming off the new lights which are for fogs, but there is nothing to plug these into so leave them.
if you want to connect the halos so they come on with the sidelights (and dipped beam etc.) then connect the halo wires to the sidelight wires INSIDE the headlight unit, as it wont work if you connect them to the wires on the outside, and if like me you only want halo rings as sidelights then simply dont connect them when you connect the halos.
hope this helps!!
ps. what colour angels did you go for??
the original sidelights as you know are towards the inside of the unit, but on the angel eyes they are on the far side.
if you want the halos on instead of your sidelights (like me lol) then connect the halo wires to the wires going to the sidelights, remember this needs to be done inside the unit itself, or it wont work for some reason!