I've confessed this before...I am an overpinner. I pin a ton. Yes, I pin the ends of 2 inch squares together. Why? Well, that's important to me! There is a reason.
Here you see my piece going under the presser foot. Notice the pin at the end.
The value of this pin? Think sailing for a moment, or any boat for that matter. The way you turn the rudder or a sailboat, or the engine on a motor boot affects the direction the boat goes. I use this pin as an engine/rudder for guiding my piece under the needle. Sometimes at the end of a piece it can veer left or right. I find this annoying as it really affects accuracy.
Here you can see me maneuvering the pin left and right. It really helps me guide the piece.
I generally sew until the pin is right under the presser food and then I left the fabric be pulled by the feed dogs into the machine and off of the pin. In this way I keep complete control of all the stitches all the way to the end of the piece.
Here I still have control of the pin with my finger and the piece is completely sewn. I now can pick up the pin and put it on the pincushion.
I hope this tip helps you with accuracy. Yes, it takes time to pin all the pieces, but it's something I find relaxing to do in front of the TV at night when I'm too tired to do anything else.
I hope you get to quilt today!