Sorry for my slow response, Graishak! No, glazing doesn't require anything other than the paints you already own. It is just a matter of watering down the paint a lot. Like maybe one part paint to have 5 or 9 parts water and then using that very thin paint in a lot of layers to shade and highlight. On a model this big, it would take a pretty long time (possibly a month or two) to make it look really good so probably not worth the effort if you're looking for a tabletop standard or want to get the project done quickly. If you ever want to paint for higher than tabletop or display-level, this technique is a must and would be great for you to learn. There are lots of Youtube videos out there about it if you want to learn more.
With all that said, this is one mean and evil looking giant. He's really coming along and its not taking you long at all to tackle this big boy. Keep up the great work!