I think you're asking too much of your set-up, especially if you're just gaining experience.
Putting a 2x converter onto the back of a lens with a maximum aperture of F5.6 (at the 300mm end, where you'll be using it most, presumably), is giving you a 600mm F11 lens which will need a sturdy support in order give you a chance of sharp shots. You'll also probably need to stop the lens down a couple more stops in order to get the best quality available with this set-up. Not a recipe for a high percentage of successful shots, even for an experienced user, I would think.
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