I get wanting to play in the kitchen. Hell, it's how you learn to cook. The only time I bother with a recipe is when I'm baking, and then it's still pretty loose with some things.
But there's a reason some dishes aren't more common, but also why there aren't more recipes written down for them. It takes guts to cook sometimes, and you have to have the confidence to know when to put down the measuring spoons before attempting some things. But don't jump in the deep end without your water wings. If you can't manage a decent potato salad or meatloaf without a cookbook, you might not want to start with beef Wellington.
That said, I botched my last go at ox tail. Tasted fine, but it'd been so long that I forgot how greasy they can be.