Keep them in their original strip till you need them. For beginner, if you need only one, cut one still closed from the strip, put that piece in the strip on the pcb around where you want to place it and then and there remove the plastick shield and place the part where it needs to be placed. Best under a stereo microscope, you can use tweezers or preferably a vacuum pincet.
When you get more and more skilled in this you can place a longer plastick strip with more components aside the pcb and move the parts from there on the pcb where it needs to be placed (longer distance), keep the height short so if it drops it will stay on the pcb and not jump half a meter in the air to the floor.