Keep up the good work and don't get to frustrated when you get into a funk on something. Just two months ago I was proud to make a cube. And then when a client requested a folding step ladder to be made of oak with some other requirements (collapse to less than 3 1/2" in depth, 3 steps with the top one ~30 inches high, etc.) I went into panic mode knowing full well that; (1) I probably couldn't find anything quite like this anywhere (2)a mock-up would be futile until I had some "good" plans to work with and (3)my proficiency with SU was lacking. Well, after about 3 weeks of struggling with procedures it finally started to all come together. Between these forums and FWW's Design, Click, and Build I found some incredible resources to help me along. By no means am I an expert or even proficient yet, but I am finding it easier to actually figure some things out on my own. And in doing so, I can actually make some renderings that look like furniture.
Good luck and thanks to all on these forums for their input.