Where the two leaves meet in the middle, I sometimes put a connecting stitch back into the first leaf I sewed, at the point.
In this photo you can see where I started stitching as I have just explained. I like to take two stitches to secure the point before I turn it under. Note where the pin is located, putting it there until those two stitches are in means the point won't float off to the left. Remove it as soon as the point is secured.
I fold the leaf back and trim out as much of the excess as I can. If you click on the photo, you can see it better. I am cutting off a little triangle of fabric at an angle.
I never needle turn this point, there's only so many times you get to do this before you get into trouble with fraying so out comes a dampened toothpick. ( put it in your mouth)
Look at where I hold it, I'm going to grab that seam allowance in the middle and sweep it away and under from the point in one movement, I then finger press it in place with the thumb of my left hand.
The second movement with the toothpick is to push the seam allowance into the leaf but not try to push it up into the point. Like I said, there's only so much fabric that will fit under there.
Don't worry about the rest of the leaf at this point. Give alittle tug on the thread to pull out the point and take a couple of stitches down the side and carry on stitching the leaf. The tooth pick is a great tool for turning under the fabric.
The other alternative to the toothpick that I sometimes use, because I still have them in my hand, is the point of the scissors. Its amazing how much control these will give you.
In these photos, see how much seam allowance I have, it's very small, only 1/8" - 3/16" A seam allowance of 1/4" is too hard in my opinion to turn under without getting into trouble with peaks and bulk.
If you are the sort of person who likes to learn visually, , try this DVD from Piece o' Cake. It is very detailed with close up shots and covers just about everything you'll need to know. There is also a book that accompanies it.