You'll need poor soil for a wild flower meadow so it depends to some extent whether the lawn has been fertilised and cared for or if its impoverished. If the latter and you decide to leave it you may have higher success if you sow in boxes and transplant plugs.

start raking and up turning the grass to show soil,then scatter seed around.

For christ sake don't "upturn" the grass as mentioned above. Wildflower areas need poor, shallow soils, tthe rotting grass will just provide more unwanted nutrients

-.- meadow plants need some nutrients! they are living things too.

I think we do all know that actually. Wild flowers do best on impoverished soil though. Without wanting to start a discussion it is not helpful to just take an uninformed guess at an answer.

Well for your information I have seen this tecniuque work before so it wasn't a "guess" as you call it plus wheni said up turn I ment dig into the ground (soil) thats beneth the grass and flip it over,its not hard,if you do it in the winter or any other rainy season,because summer just drys the ground and its then almost imposible to dig.

Steragram is right. It works best to strip off the grass and remove completely before seeding with a wild flower mixture; plug plants in short, weak grass also works.

Meadow plants need minimal nutrients, they get all the nutrients hey need from photosynthesizing. Infact when we plant our meadows, we initially often plant hungry plants to try to strip the ground of any excess nutrients.

You can "flip over" turf for most plants....not for wild flowers though.

As a child I loved wild flowers. They grew on the edge of cornfields, in the poor soil under the hedges.

I would dig up the turf and stack it to rot down for loam.
Then use the open land. Easier to weed.