You can find info on rooting, guides, ROMs, and other info here:

http://androidforums.com/evo-3d-all-things-root/495121-htc-evo-3d-all-things-root-guide.html

As for the specific guide for rooting, I wrote one here:

http://androidforums.com/evo-3d-all...ms-kernels-using-fastboot-updated-3-26-a.html

 

No. There is no chance of bricking your phone with the HTC method, unless you purposely try to brick your phone (and even then, it's hard to do). Those of us who have 1.40 and older bootloaders with S-OFF do, though.

 

You need to read read read and read
I have been here a lone time I have
rooted a lot of EVO and all I do is READ.

 

Yes. A guide that frequents this forum is in the process of drawing up some instructions on how to do so. It's fairly easy/straightforward to do it.

 

You won't lose anything on your SD card, so pictures, files, and things of that nature will be un touched. But the rooting process with the HTC Dev unlock will wipe your device clean of any user-configured data. Like accounts, apps, etc.

Some people use a temporary root to install a backup app like Titanium Backup or MyBackup Pro and make backups of all their apps to their SD card before doing the HTC unlock.

Tools like Titanium Backup are mostly essential to people like me who flash new ROMs on a weekly basis Although I've been told that MyBackup Root/Pro is just as effective and slightly more user friendly.

 

Nearly everything. If you use Sense, you'll lose your widget locations, icon setup, and small things like that. But your save games, high scores, and other settings like that would be preserved.

 

You should use caution when picking ROMs. Read what the ROM adds, if there are any known bugs, etc.

Make NANDroid backups (Called simply 'backup' in custom recoveries) often.

And make sure you flash kernels properly. The new 4EXT recovery and the TWRP Dumlock recoveries do this automatically. Older TWRP recoveries (2.0 and earlier) and all CWM recoveries do not do this automatically. 4EXT is highly recommended, but you'll have to use another recovery in order to install 4EXT for the first time (it's annoying...but once it's done, you're good).

And if you don't know what you're doing, don't overclock or undervolt.

 

Overclocking (Called OC for short) is making the processor faster by increasing it's clock speed. The faster the clock, the faster the CPU processes information, and the more heat it generates and power it consumes.

Undervolting (UV) adjusts the voltage tables to the CPU. The less voltage applied to the CPU, the less power it consumes.

It is possible to balance the two to make it so that you have increased performance balanced with power drain to equal out in the positive. But it's not something I recommend for people who have no idea what they're doing. Usually people OC first, get the hang of that, then UV to balance out the power drain caused by it.

OC and UV both can cause system instability and permanent device damage if done improperly.