I don't believe I've ever written a scene actually involving dragons - huge or otherwise. :) If I should ever need to because it doesn't make sense otherwise, I'll bite that bullet. For example, a story I wrote had to touch on the thestrals, so I simply don't dwell.
The magic element isn't so bad. It can come in quite handy, really. It's the creatures that tend to make me cringe. (Dobby! Argh!!)