You must have experience using a soldering iron. This is not a easy thing to do for some one that has little experiece soldering.
You must have steady hands. If you touch the tip of your iron to the led dome it will burn a spot on it that you will never get rid of.
I'am not saying you can't do it. It can be done.
I solderd an xml that way once, its doable but you really need to secure the wires somewhere near the emitter.
If you dont do that those little soldering pads may come off.