Installation woes

I feel like an idiot, but i have to ask... I am building my first cabinet and have purchased an ET65 and Veteran 30. The build is going well, but I am having trouble understanding how to mount my speakers to the baffle. Woodwork is not my forte, but I'm great with computers ;) So, I have my baffle and have already cut the holes for the speakers. I have t-nuts for mounting the speakers. I assume I can also simply screw the speakers directly to the wood. The difficulty for me is figuring out where to put the holes.. I know this sounds silly, but perhaps someone can walk me through this? It doesn't seem as simple as laying the speaker down on the baffle and marking where the holes are because I can't see "through" the baffle to make 100% sure the speaker is lined up with the hole, as the circle I cut is not a "perfect" circle. The speakers each came with some foam with adhesive back, and I thought that would be great to use as a template, but since the foam is in four sections, it once again becomes difficult to precisely place because as I lay them around the hole in a circle, i have trouble getting it to fit in a perfect circle. I know my analytical nautre is kicking and and I am probably overthing this. I just need some help understanding the best method for mounting my spekaers at this point before I destroy some rather expensive birch ;) Here's a link to my build in progress: https://plus.google.com/+MykRobinson76/posts/dKRyHEHGxQm Thanks for any help you guys/girls can provide.