I did it myself, it was a breeze. I use
midPhase as my webhost and they have a killer
control panel. I didn't have to write any of the SQL, just typed in the name of the database, created a user and pressed the button. After uploading the files for MediaWiki you just go to the root folder from your web browser and it presents you with the install routine. Regarding the third level .name domain name - I bought that at
doster.com then changed the DNS to MidPhase and from my control panel (above) I created an add-on domain so that everything looks the way it should in a web browser and I don't have to pay anything more than I already do for my existing account.
If you decide to go this route I can assist - ChrisWB helped me. I'll pay it forward