As far as getting the coal to the bird's nest, if the problem is a crumbling coal, before you move the coal from the hearth, use a coal extender (something like punky wood, True Tinder fungus (Inonotus obliquus) or False Tinder fungus (Fomes fomentarius). Start the extender glowing, then transfer the coal and the extender into the tinder bundle. You can drop the coal and the extender and the coal will fall apart but the extender, like the Energizer bunny, keeps on going and it is sufficient, by itself, to start up that tinder bundle. The other benefit of the extender is it's increasing the size of the smouldering mass which increases the heat and helps spread the glowing (for lack of a better word).
The other problem people have with the tinder bundle is they either make it too loose, thereby not having the bundle material in contact with the coal (in which case it won't spread), or they have it too tightly packed which also has the same effect. One other thing, don't be shy with the size of the tinder bundle. Nothing worse than almost having it and you run out of material. Another thing you can do is contain the tinder bundle in a piece of bark to prevent you from burning your fingers.
A battery powered fan also helps.
Good luck.
Doc