So, I'm embarking on a romance for the first time.

What do you wish you'd known? What do you think newbies tend to get wrong?

Mine's a multiple genre one, historical/romance/suspense, quite heavy on the history and suspense but I am thinking of making the romance the backbone. Due to the history the HEA will probably be against the backdrop of some very sad events, so kind of a bittersweet thing... trying to balance the sad stuff is part of the reason I'm thinking of going heavy enough on the romance to actually qualify as Romance. Is that a bad idea, do you think?

(Incidentally, what exactly is the meaning of "Romantic Suspense"? Trying to figure out if this fits in that pigeonhole or not.)