I’m not going to lie, Magento is hard. The codebase contains 30,000 files. It’s like WordPress’s much more sophisticated older sibling. It’s modular and designed to be chopped up and hacked so long as that is done in the right way. There are plenty of wrong ways.
If you need to run a website on your local mac, you’re going to need to follow read “Installing Nginx in Mac OS X Maverick With Homebrew“.
That should give you what you need to then attempt to install Magneto for the first time. To be fair, that part is quite easy. It’s when you lift up the hood and catch sight of all those olden days cogs and whirring moving parts that you realise that there’s a lot more to Magento than a shopping cart.