1. Easy, just run an app if you have cIOS rev 14 already.
2. How do you update Neogamma? Just install new channel or new boot.dol to sd\apps
3. Install application wad or boot.dol to sd\apps
4. Updates are still user permitted actions. Refuse to update and you'll stay at 4.2.
5. Learn and it will be easy.
Keep away from System Menus and critical IOS and you probably will be fine.