Well, Sean, I think you probably know to keep plenty of blades around ! haha
I have the 750 as well, and I love mine! That video is very well done, but it also shows how to use all the other mat cutters (one video fits all) so you'll have to either sit through or fast forward through things to get to yours...if you've never done this before, you might want to 'cut along'!
I think the machine is sent with a backer board, straight cutter and bevel cutter. One thing important is to remove the backer board if you are using the straight cutter, and make sure it is in place if you are using the bevel cutter.
I made up some sheets to help me figure out mat sizes for double and triple mats. If you think it would be helpful, I could post them here somewhere for download, or email them to you. There is a lot of good info at Logan's website as well!
Happy matting!