Default M7 root/unlock question

Hello anyone. I'm brand new to HTC. I got a M7 today that has the 4.4.2/Sense 6.0 update. I come from primarily all Samsung devices which are extraordinarily easy to hack. All of this S-Off and different bootloaders and whatnot is foreign to me. I gather that the 4.4.2 update has thrown some sort of a wrench in things root wise. What's the easiest way to get a custom ROM on this thing? I'm fairly proficient with ADB. Appreciate any advice.

Thanks!