After a long long time and one smashed capsule tower, I finished the Estes Mercury Redstone build. It was pretty frustrating at times, and I struggled, but I did it. If you don't look too close, it's not that bad!
I know where all the flaws are, and there are many. That capsule will probably pop off after the first landing. But for now, I like what I've got. And I have a few more of these kits, plus some extra capsules, so I can try again.
I think you need to build the hard rockets, so you can get better. I used to be one of those rocketeers who held on to those "special" kits because I didn't think my building skills were up to the task yet, and I wanted to "do it right on this one." But if you do that, you'll never build that Saturn, or Redstone, or whatever special "master-level" kit you're holding on to.
Do your best, and it'll probably turn out better than you think. Then the next one won't seem so daunting.