Craft 3 via composer with Mamp Pro Is it possible to get an idiots guide to this:

Error on Craft 3 install

I'm just not following the context of the answer/commands, a detailed step by step would be invaluable for fear of trying something, not really understanding what's going on and possibly doing it wrong and affecting dependent tech, just a thought, thanks.
nystudio107 just released a nice guide yesterday for setting up a Craft 3 site via composer.  No mention of Mamp Pro, but I don't think that should really be a problem if you're already used to using it, as you would just make sure your hosts file is pointing to the /web/index.php file.  The article does a great job of explaining what a lot of the terminal commands actually refer to instead of just telling you what to type in.

https://nystudio107.com/blog/setting-up-a-craft-cms-3-project