I think everyone goes through this... well, most people, anyway. Such is the burden of intelligent awareness--you know other animals don't worry about this shit. And, therein lies a clue.
Funny you should mention tree removal next to my house. But, no way I'm trying that job myself. I love that tree, but ever since I noticed it's leaning a bit toward my house, and the wind we have around here... I can't wait to get it gone. I'm looking for something short to put in its place.
I use the Measure It addon. It adds dynamic dimensions between two vertices, just for visualization for the cut list.
For this simple bed, I just add a cube, enter the dimensions, and then rotate and snap each piece into place. Vertices, faces, and meshes can be selected and moved any arbitrary distance along any axis as needed to tweak the design.
I've used FreeCad and Fusion 360, but I don't really need either for what I do, I'm comfortable in Blender as I've used it for ~15 years now.
Man. I tried to buy the cheap one ($150), but the reviews scared me. I went with the cheap DeWalt at $250 on sale, plus a $50 blade. The worst part is, I'll probably rarely use it again. I might sell it after, but I doubt it. I do love tools.
My foot is already up on my leg, the shoe is right there, why not put both on?