This is a topic that comes up a lot, you won't be surprised to hear! What's "too much" for one person may not be for another. And personally, I have days when I think "why did I take this on?" and other days when I think "I love this!". If the plot really is covered in weeds, and it looks daunting, I would try to cover a lot of it in black plastic (strim it first if it needs it) or put weedkiller on it if you're not organic, and concentrate on a manageable area so you can get something growing fairly quickly. When you uncover the rest in the spring, the weeds will be easier to get out, and by then you'll know how much is "too much",hopefully!