It's very different. With LFS you build your own distro. You bootstrap the filesystem, build your kernel and everything else from source, and there's no package manager. That means manually managing dependencies, which is a nightmare in and of itself, and something we take for granted with Linux distros.

The LFS book is quite thorough, so you technically only need to copy/paste commands, but you learn _a lot_ about Linux in the process. I highly recommend it to anyone interested in Linux. I did it once in college, and parts of BLFS IIRC, and it's one of the few memorable projects I got from my degree.