Step By Step: How To Install WordPress MU
These are specific instructions for installing WordPress MU. WordPress MU is a multiuser blog script. This means an unlimited number of users can have an unlimited number of blogs on one WordPress install. If you just want one blog, this is NOT the tool for you!
I hope they help!
Step One: Create a database for your blog network. Create a user and access rules for that DB as needed.
Step Two: Download WordPress MU.
Step Three: Unzip the files locally and upload them with FTP to where you want the blog to be installed. Note: just the files, not the wordpressmu-1.0/ directory that the files are extracted to.
Step Four: CHMOD 777 the directory you uploaded the WPMU files to and the wp-content/ directory.
Step Five: Load your blog in your browser. If you did it right, you will be presented with a form to configure and install the blog. If you do not get that form, you made a mistake or WordPress upgraded. Either way, the instructions on how to fix it should be on that page. Follow them, redo the steps above, get help or hit the comments below. Always check the publication date on your documents. 
Step Six: Fill out that form. Now you should see a Congrats! you’re done! If not, the same reason as above follows. The same steps to fix it need to be followed.
Step Seven: Check the email that you provided in the last step for your password.
Click the login link and configure your blog(s) and start posting!
Tags:blogging howto wordpress mu
What I didn’t care for in the install was that there was no mention in the docs or in wp-config-sample.php that you should not alter that file, nor copy it to wp-config.php as you do with a standard WP install. Luckily I still had the original version and removed the copy I made, but it took me a bit of digging to find that solution.
actually, truth be known, the WP documentation verges on…. well, let’s just say I find it seriously lacking…. coming from my slack self, that’s pretty bad
thanks for pointing out the gotcha that I missed! hopefully it will save someone else some cursing.