ARHD is great for a first-time modder for two reasons:
1. The ROM is solid, stable, and further customizable.
2. The documentation is clear.
I visited the site,
http://www.htcsensationroms.com, and read about the different ROMs and their procedures. Android Revolution HD (ARHD) is the one I recommend. Follow the conditional logic in the documentation and it will navigate you to different posts in order for you to obtain the tools necessary to prepare your phone and satisfy all of the requirements before you actually flash (firmware), wipe (phone), and flash (ROM).
Before you actually do anything to your phone, I recommend that you take time first to read thru the various posts you will pop as you learn how to satisfy one prerequisite after another. Familiarize yourself with the process and the steps you will have to take. Build a mental checklist (or use pencil and paper) of the things you will need to do before the step when you actually boot up your phone into bootloader have it automatically install the contents of PG58IMG.zip.
It all starts here...and there lies within.
http://forum.xda-developers.com/showthread.php?t=1098849
# /*************************************************
# ---------
# Tommy T.
# -----------------
# HTC Sensation 4G
# TMOUS
# Android v4.0.3
# HTC Sense v3.6
# Android Revolution HD 6.6.4 by mike1986
# ---------------------------------------------------------------
# Kernel version: 3.0.16-gda3fdfc;
[email protected] #1;
# Baseband version: 11.69.3504.00P_11.22.3504.07_M
# Build number: 3.32.401.5 CL309896 release-keys
# Browser version: WebKit/534.30
# ---------------------------------------------------------------
# *************************************************/
Edit: ^^^^^Was that all even necessary?