To start, you'll need a program that will set up your phone for root access. For the Inspire, the most popular is the Ace Hack Kit which was developed by a user on the XDA forums; most rooting programs will usually be found within the popular Android user and developer forums. These are actually great places to not only find out more about rooting, but you can also ask questions to active users.
Once you have downloaded the Hack Kit, make sure that you follow the instructions precisely. Again, programs and forums will usually have detailed instructions that must be followed to the letter so you can avoid bricking your phone. One step that you will need to take is to turn on your Inspire's USB debugging option within your application settings. This allows for debugging and development of applications on your phone. To enable this, go to
then check the USB Debugging box.
It is a very good idea to back up apps, files, music, and photos, though some of the root kits may have an option for you to back up your apps. However, just like you would back up your information before you would reformat or sell a computer, it's best if you just move items to your computer. This is easily done by connecting your phone to your computer or removing your SD card and using an adapter to copy or move items.
When everything is all set up, clear your time as this can be a timely process. Start the program you decided on and follow the instructions. When finished, your Inspire should automatically reboot itself into boot loader, where you can then continue the rooting process. In most cases, you'll be selecting the option "hboot" and then the phone should detect the ROM that was installed with the root program.
From here, you'll be setting the phone up so that you will be able to gain root access to your phone, which then opens the door to more opportunities.