Hi, sorry for late reply, wasn't around for a week. For those pic, I used a tripod. But also possible handheld if you can handle slow shutter speed like 1/4 sec.
Steps are as per norm as IR photography such as getting custom WB setting from sun lit green grass while filter on and then take a shot. With LX3, you can compose the scene and faster shutter speed. But you may get a big hot spot in smaller apearture or under bright sun light. You can avoid by zooming in or using wide apearture.
PP also same as normal IR processing such as changing hue, level, and contrast or red and blue channel swaping.