[Q] M7 : Root without power button? / ADB ? topic

I picked up an M7 with a busted power button and want to root it because, reasons.

I'm on KK 4.4.2 with Sense 6 (use Nova Launcher though) and my kernel version is 3.4.10-gb9492d4 root@abm004 #1 SMP PREEMPT

I looked through some similar threads about this for Samsung and Nexus devices and found that I can use 'adb' in cmd on Windows to reboot/boot to recovery and such but when further researching I couldn't find "step 1". Any atempts to do it in cmd came back with errors saying I could not do it due to missing something, or in the case of a GUI assisted Windows tray app I found on XDA(can't remember name), saying no device was detected at all.

I also read some business about having to have "fastboot" enabled but without a power button and a having a metal unibody phone I'm still stuck.

Sorry if this has been covered but I Googled extensively and kept coming back to "but where do I start?" I have rooted a Samsung S3 before but obviously it was a different process considering I have all working buttons on the thing.

Thanks for any help!