it was infact quite hard, pretty impossible to do if you're by yourself.
you can go read the steps for removing the dash cover from volvospeed.com
However since you can only remove the left side, you have to bend the whole cover upwards very hard to remove the rather big speedometer unit.
Get someone to hold up the cover while you try to squeeze the unit out.
Changing the lights were a snap, however you should try testing the lights for brightness and color before putting them back in if you could, cuz you really don't wanna do it again (like me) unless you like touching hard edged plastics and bending your dash cover til they break