Superfish Tweezers (misspelt as tweesers) are made of stainless steel and due to their length make planting very easy in a small to medium-sized aquariums. It's much easier to use tweezers when planting a tank as it avoids disturbance into the substrate.

Simply take the plant in between your tweezers and push gently into the substrate then give it a wiggle. Remove tweezers slowly for perfect planting.