What is the best way to do this effect?

Turn your footage into a 3D layer. Duplicate your footage layer or add additional 3D footage layers and position them into a videowall type grid. I would then create a null and parent all of your 3D layers to the null. Then animate the null so that it zooms out from your original frame (exposing the videowall) and transition and zoom in to the next layer you want to see.

You can also just create a camera and animate that instead. Whatever you find is easier.

Either way you'll probably want to create at least one 3D camera to help arrange your footage layers better.
 
position them into a videowall type grid, whats the best way to do that, is there a grid that i can line videos up with, i got everything else and i think i can do this now but if there is a grid that videos can snap to that would make it even easier
 
Here's an alternative approach. It's really not as complicated as it appears here.

Make a source comp
Create a comp that is double the size of your final resolution. For example if the final res is going to be widescreen square pixel (864 x 486) then you would create a new comp that was 1728 x 972, double the width and height. Name this comp Quad comp. Drop the two clips you want into this comp, duplicate the clips so you have a total of 4 clips. Position the clips to form a quad view.

Add the effect
Drop the Quad comp into another comp that is the size of the final resolution, in this example the comp would be 864 x 486. Add the CC RepeTile effect to the Quad layer and then scale the Quad layer to 30%. Adjust the effect settings (expand right, left, down, up) until the frame is completely filled in the checkerboard pattern.

Animate
Scale the Quad layer back to 100% and position the layer so that only one image fills the frame. Turn on key framing for scale and position. Move down the timeline about a second and scale the image down to 30%, move down another second and scale to 100% and reposition to a different picture. Do a RAM preview and enjoy.

There are lots of benefits to using this approach. It should render much quicker, it's a 2D effect. In order to swap out shots all you need to do is replace the 4 shots in the quad comp. In the effects control you can experiment with the tiling modes (repeat, random, unfold, etc.) to see if there an interesting look that you might want to use.

Have fun with it!
 
Milksac is right on. This is the way I would do it. It will be your best approach and quickest unless you know scripting.
 
I think all the above would work, try them all and see which you prefer, that way you'll learn a bunch as well.
 
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