How to Easily Upgrade Hboot, Recovery & ROM on HTC One M8 ???

Hi,
I have now tried for days to figure out and experiment with how to upgrade the following on my HTC One M8 (rooted & S-OFF), searching this and other forums, nearly bricking my phone:

hboot: 3.16 to latest version

TWRP: 2.7.0.2 to latest version

ROM: 4.4.2 from stock to latest Lollipop version of CyanoGenMod (or other, if better with regards to costumization and speed)

Here's my "getvar all" info:

(bootloader) version-main:
(bootloader) version-misc: PVT SHIP S-OFF
(bootloader) serialno: SH432WM04422
(bootloader) imei: 358714055162121
(bootloader) imei2: Not Support
(bootloader) meid: 00000000000000
(bootloader) product: m8_ul
(bootloader) platform: hTCBmsm8974
(bootloader) modelid: 0P6B10000
(bootloader) cidnum: SuperCID
(bootloader) battery-status: good
(bootloader) battery-voltage: 0mV
(bootloader) partition-layout: Generic
(bootloader) security: off
(bootloader) build-mode: SHIP
(bootloader) boot-mode: FASTBOOT
(bootloader) commitno-bootloader: 098a72e5
(bootloader) hbootpreupdate: 11
(bootloader) gencheckpt: 0

I would be very grateful for a strategic overview of what to do first and if possible step-by-step and video directions ;)

Kindly,
Kaliya