Spindle spinning isn't hard, although it is time-consuming, but some people just never get the hang of it. If you've given it your best shot and practiced and practiced, but you still just can't get your yarn to look anything like yarn--or if you're doing pretty well but you hate the whole process--don't give up yet. Spindle spinning is nothing like using a spinning wheel. Before you use the rest of your roving as garden mulch, ask around at your local yarn shop or knitter's club and find someone with a spinning wheel. Have them give you a quick lesson (they'll be amazed at how much you already know from spindle spinning). You may love it! But don't throw out your poor spindle, either, because you may just decide to give it another try later.
Now about that mohair or lambs wool/cashmere blend yarn you imagined back before you knew how to spin--you can make your own now. And it won't break the bank, because buying the fiber and making your own yarn is a lot cheaper than just buying the yarn. Plus, of course, you have the satisfaction of knowing that you made that sweater or scarf from your own handspun yarn. That's something to brag about!