1) It is never as simple as the marketing claims.
2) Search the forums for GoDaddy. There is ongoing thread on how best to install to this huge (i.e., no support) web hoster. It is almost as large as the one about hosting to the other mega (i.e., no support) web hoster, 1and1.com.
3) There is LOTS of info about install (and upgrade) issues in the forums. Unfortunately I've not found the online help in DNN very friendly to navigate, the documentation is no longer listed on the downloads page for the current version (probably because it is all so easy anyone with any smarts could use it- NOT!) and so one needs to buy a book or hunt about for the answer.
4) You should be able to search for much more complete answers, but to get you started (on your own machine, running Windows XP at least):
To Install:
- Install IIS 6 (Control panel | Add-Remove Programs | Windows Components)
- Unzip Install version of DNN from DNN's Downloads page to E:\Inetpub\wwwroot (or where ever) and use IIS Manager (in Control Panel Admin Tools) to make that directory an application.
- Edit the Web.config file (specifically pay attention to SQLServer Connection strings and machine key - search other posts for much more on this)
- Open web browser and go to site. It shoudl start the install process and it shoudl all just "work"
5) They have simplified it greatly. Check out:
http://www.dotnetnuke.com/Projects/UtilityInstaller/tabid/838/Default.aspx
Oh have you even gone to the Install It section of the forums at http://www.dotnetnuke.com/Community/Forums/tabid/795/forumid/107/scope/threads/Default.aspx? They have a couple posted stuck to the top with instructions...