I use a knife (butter type, not sharp) but anything flat will do nicely. Unless the seedlings are really close together I stick the knife in an inch or more away from the seedling and carefully lever it up with some compost. I am not very delicate so I try to avoid handling the seedling at all and just hold the compost lightly against the blade - if I do need to hold the seedling always do it by a leaf, but mostly I can avoid direct contact.
Don't be fussy about how straight the seedling is in it's new pot - it will straighten itself up soon enough and it is not worth risking damaging it trying to straighten it.
If the seedlings are congested it's difficult to dig out one without damaging the roots. In this case I tip out the whole tray -not upside down -but you can flick out the whole tray with a sort of backwards scooping action. Then you can gently pull the seedlings apart.
if seedlings are a bit congested, I lift out the whole lot, then split in half, then those clumps in half , repeat until you can get individual seedlings.
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I use a spade
I use a knife (butter type, not sharp) but anything flat will do nicely. Unless the seedlings are really close together I stick the knife in an inch or more away from the seedling and carefully lever it up with some compost. I am not very delicate so I try to avoid handling the seedling at all and just hold the compost lightly against the blade - if I do need to hold the seedling always do it by a leaf, but mostly I can avoid direct contact.
Don't be fussy about how straight the seedling is in it's new pot - it will straighten itself up soon enough and it is not worth risking damaging it trying to straighten it.
Fishy
. Now your just being silly
Oh yes Granny all established
potting on ers should keep a pack to hand with their hair net 
If the seedlings are congested it's difficult to dig out one without damaging the roots. In this case I tip out the whole tray -not upside down -but you can flick out the whole tray with a sort of backwards scooping action. Then you can gently pull the seedlings apart.
if seedlings are a bit congested, I lift out the whole lot, then split in half, then those clumps in half , repeat until you can get individual seedlings.
sorry Primrose - used the hairnet to store bulbs!
Wonderful how ladies can not only multi-task, but multi-use various articles! Love, it, gardening granny.