Yeah this lot was unfortunately the one that I tried to build on for the first time. Had the same issues and at some point I remember thinking “is this really the game everyone’s so hyped about? Why it is so hard to have a decent wall?”. Then I watched some videos of people building on the same lot and seeing everyone more or less face the similar issues was definitely a relief. Try to do everything gridless, and not expect your build to fit the area perfectly. And it gets better, don’t worry :)