I mix it on paper plates. I use a disposable 1.5 or 2" plastic putty knife to mix it and apply it, unless I am just gluing on small pieces. At those times I use popsicle sticks.
Using the putty knife, I can grab a glob of it and , as above just slowly spread down the lamination. I find that I put it on too thick and I go back over it lightly with the knife at more of a 90 degree angle and scrape the surface again. I get a lot of the glue off, to use further down the lamination. It seems that if you get all surfaces wet with the glue, you do not need much for a good glue joint. Too much and it is difficult to handle, difficult to get the lams to stay where you want them and then after you apply pressure and heat, you have a mess with excess glue working its way out.
ChuckC