Take your seedlings, which you planted all together in a single pot. When they have developed a second set of leaves they are ready for potting up.
Gently empty the seedlings and soil into a tray.
Fill a small pot with compost, and poke a hole in the middle with your finger (or pencil or other poking implement, if you prefer).
Take one seedling, along with its roots and any soil that is attached, and drop it in the hole you just poked. Hold the seedling by a leaf (do not hold the stem), and gently lower it in.
Gently firm the compost and top with more if you need to. Plant tomato seedlings quite deeply (covering the whole stem up to the bottom set of leaves), as new roots will grow out of the stem.
Write a label so you know what you've just planted.
Put the newly planted seedlings into a tray, and fill with water to allow the compost to absorb the moisture.
That's all there is to it. Just keep your plants watered, fed and in the sunlight and you'll have tasty tomatoes before you know it!
- Pencil, or other poking implement