You should not need any load resistors if you use replacement type 'bulbs'. They are designed for 12v operation.
If you replace turn signals then you might have to do something for the flasher to operate properly.
I have an LED replacement headlamp. It works fine for what I want, but...the light pattern is not ideal. Driving and headlamps made for halogen will not be efficient with LED's. You will probably get more beam spread and less at distance. If long range performance is not your goal they will work fine.
If you get driving lights made as LED they do perform well and draw little current.
And, yes, I love my LED strip on the trunk too (not a Norge).