Welcome to the money pit :-D
I'm, not sure what you mean by bunching together, and it is a bit hard to see the body/hackle stem in your picture (try the macro setting if your camera has one). I think the most important thing with any hackle is to take your time. Treat each turn separately and brush the fibers back after each turn. You should be able to lay the stem where to want it to go, so if by bunching up you mean that the turns are too close to one another, you should be able to space them. If the body is chenille, then each turn should sink in a bit to keep it from sliding. I used to have a lot of trouble with hackle pliers either breaking the hackle or slipping off. this made me try and race to get the hackle tied off, and the results were usually awful. You can try a little shrink tubing over your plier tips if this is a problem, but I think wrapping the hackle by hand is actually a pretty good way to learn control.
Not a bad start at all. I wish my first ties looked as good.