Noob with some questions as its been forever since flashing anything

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http://forum.xda-developers.com – Hey All. I Did my first flash ever with my Evo3d and the Viper Rom way back when it first came out. With the Rev tool to get unlock and S off. Now Ive had to have my phone replaced due to a bad digitizer and id like some ICS fun. But the Phone is now Hboot 1.50. Ive had Ramjet explain some stuff but still having some confusion. I did the HTC unlock and the phone is unlocked. I now need to install/flash 4EXT recovery. I assume this is something I need to flash to the bootloader/Fastboot Vs just a download (which I did get the paid for app.) Ive been r4eading some of the stuff here and there. Bu (HowTos)