Bill_a

Ok, Bill, and many many others who had trouble with this process.. so did I.. so here's a list of things that can/did/will go wrong.
 
1:  The Unlock app process must not be run on a Windows machine running an AMD Ryzen processor. Please find an Intel-buddy and get it done there.
2:  The mi-unlock zip when you unzip it comes with a driver installer file.. Run this as Admin, then plug in your 'fastbooted' pocophone.. Make sure the software reports that the driver was installed.
3:  Unplug the phone again, Then run your miflash_unlock.exe and re-plug in your pocophone again.. or try a number of combinations of not unplugging and unplugging.. and it should figure its way out..
4:  Once you finally get to beyond 50% on the unlocking process (which is where it stops on Ryzen), you may then get to 99% and it might tell you to come back again in XX hours.. mine said 62.. ?
5:  After 62 hours, you're around 2 hours away from done..
6:  Once unlocked, you should reboot again and get back into 'fastboot' on your phone, and then go to your c:\adb\ location and run the fastboot commands..
7:  The fastboot commands, not well documented from the video, or the post links, are:
     7a:   fastboot devices           (checks whether or not it sees the device)
     7b:   fastboot flash recovery recovery_20181211.img          (you must have copied the recovery-20181211.img file to c:\adb\ for this to work!)
     7c:   fastboot boot recovery-20181211.img          (tells the phone to boot into twrp!)
8:  You then can see the pocophone in your windows "this computer" and can copy files to the TWRP directory inside.. once TWRP is loaded.
9:  Flashing Magisk helps with the unlocking process.. to the best of my knowledge..
10:  go SLOWLY inside TWRP, you can really mess stuff up.. !
11:  Once you've deleted the directory mentioned in the video, you can follow the next few steps kinda easily..
12:  If you ever boot the phone, and you still need TWRP, go back to step 7 with a fastbooted pocophone, and repeat a, b, c.
13:  replacing the bootloader with ruthless isn't painless, and then getting to the ruthless pixel launcher settings is even more of a pain.. but it is possible with a little fumbling around.. I can't remember the steps, and would have to go through them again to get there..
14:  to get to ruthless pixel launcher settings,, flick up to get the search bar at the top.. type ruthless, press and hold when the app displays, and select "app Info" then scroll to the bottom and do 'advanced' then scroll further down and tap "additional settings in app".
15:  the dock settings are under 'dock' then under advanced settings, and then you put the searchbar radius at 100, turn ON custom bottom searchbar color, and set it to WHITE in the next box, and then put searchbar transparency at 100.
16:  I can't get the ruthless pixel launcher to show weather at the top of the screen next to the date..   can anyone help me?
17:  I have no idea "what google apps" i really want.. especially since I was considering coming from an iPhone.
18:  Re-Magisk-ing after you get it all set up stops the warnings about this being built with public keys or somesuch, likely to do with phone security measures and detections..
19: I can't replace the default camera app, so you just have to be careful to run the Google Pixel camera app every time you want a camera.. ?
20:  You lose the 'swipe' to do stuff functionality of MIUI 9/10 when you move to Lineage..
21:  There appears to be no way to go from lock screen to camera quickly, you must unlock.
22:  Fingerprint scanning works real fast on lineage, never tried to set it up on MIUI.
23:  I can't seem to find any option that turns on "IR Face Unlock" even tho the latest lineage supports it, or claims to, back to google for me.
24:  why is there no default 'weather' app on google play?
25:  I haven't tried installing any other app stores, but XDA's does work ok.
26:  I wish there was a way i could perma-tether this to my iPhone's internet connection while I dared to set it up..and I'm going to desperately miss iMessage if I switch.
27:  Anyone wanna buy a Red 128GB Pocophone F1 ?  I have no idea if I'll keep using it.. In the USA. 
 

I have to say this is one of the worst guides to do this. It skips certain things that beginners like me will not know, is super vague for some reason. I mean if you want to post a shorter video thats fine but this really isn't a comprehensive guide. I have not managed to install those google apps but I managed to somehow install Lineage. 
Hope I don't brick this. :/