How do you pin the layers?

[coffeebreak]

I have to use pins to secure the layers for quilt stitching. Here's i pic of how I pin it all together then STID in the seams and will stipple or meander in the larger areas. Big sqs are 10x10, smaller sqs are 4x4 and sashing is 2". Any comments or tricks of the trade to using the pins? Other than it takes alot of pins (had to order 3 packs today from MSQC - boy are they a great asset!)

Please comment on your pinning theories/strategies or just....how do you do it's?