You are correct. The sheer complexity of the different Linux distributions is one of its chief faults. There are simply too many different distributions that require you to know too much technical details about how to use each one. The different ways in which you setup, install, and use Red Hat to SUSE to Ubuntu to Debian are mind boggling and a definite turn off.
However, the BSD operating systems solve that problem. What you learn with FreeBSD is something you can translate to OpenBSD. It is more structured, coherent, and uniform. It is also much much more stable, reliable, robust, secure, and free in terms of licensing restrictions than Linux. That is why I am obsessed about mastering it along with Microsoft Windows and Red Hat Linux. In fact, I have budgeted about $80 USD toward the purchase of the latest Red Hat Fedora CORE 5 and Enterprise Linux 4 book along with FreeBSD 6.0 book at Barnes & Noble where I work this Friday, June 9th, 2006 because I am entitled to a 40% discount as an employee. I know that I can go online and read the manuals, but the problem is that with three different operating systems, it gets to be highly cumbersome to read and apply what I've learned without access to another computer (which is a reality I must contend with).
Why are you trying Linux? Have you considered other alternative operating systems such as FreeBSD? Would you consider renting or purchasing a book about the specific operating system you are trying to install on that computer to help you learn?
Trust me: it is damn hard to learn Linux and FreeBSD without a manual or book. You should go to your local public library and rent the latest Red Hat Fedora CORE 5 book. It will help you learn faster with fewer crippling mistakes that would mess up your OS. This stuff is way way too complex to try trial and error on your own.