You don't have to plonk it straight on the main display shelf of a boutique patisserie or anything, just pass some slices around at a small dinner party - amongst people who have experience baking or eating similar cake - listen to what they have to say, and keep an open mind.
There aren't really any foolproof recipies as such, but the more you know about how you want it to taste, the easier it will be to know when it's ready.
That in mind, I believe this comment could be particularly helpful:
Good luck!the_planet wrote:Only through experience can you truly get a feel for when the cake is ready. You need to do more baking, and eat more cake by professional bakeries.