I'm just now trying this too-just did a lap quilt and now I just need a new chair so I can quilt it. I hope it works! I felt most comfortable holding the tip of the glue on the batting and then just slightly squeezing and moving it in the zig zag pattern. I didn't feel like I had enough control holding it above. I just have to wipe the batting residue off the tip every few rows. I ordered some tips but honestly don't know if I'll need them-I didn't have any trouble using the tip that was already on the glue bottle.
I would like to find some colored school glue though. The white was impossible to see on the batting so it was hard to see how much I had applied.