Recommended / Limited / Difficult for use with OpenWrt

Question to all: Which of these installation methods would qualify for "Yes, that is easy installation?"

This posting is wiki, i.e. everybody can edit the table below.

Installation methods taken from https://openwrt.org/inbox/docs/installation/start#all_installation_methods

Installation method Easy? Noob? [Y/N] Advanced / Amateur [Y/N] Developer / Pro [Y/N]
ADAM2 FTP
Asus Firmware Restoration Tool
brnboot web recovery
CF card No (who has a CF adapter handy?)
CFE TFTP + serial recovery No
CFE TFTP recovery
CFE web recovery Yes (It seems fairly easy)
CLI generic
D-Link recovery GUI Yes
EVA FTP
GUI generic
GUI OEM Yes
JBoot web recovery
JTAG No
Linksys TFTP
Mikrotik TFTP Follow instructions here using bootp and should be good
Netboot
RedBoot TFTP + serial recovery No
RedBoot TFTP recovery
SD card Dicey if you need to format Linux on a Windows/Mac, OK if "dd" of a full-disk image
see devicepage Unlikely
see forum Unlikely
see git-commit Unlikely
Serial No
Sunxi installation
Sysupgrade Yes
Telnet
TFTP generic
TP-Link TFTP Archer C7v2 era, yes, later?
U-Boot TFTP + serial recovery No
U-Boot TFTP recovery Generally yes
U-Boot USB recovery Generally yes
U-Boot web recovery Generally yes
unknown No
x86 installation With improved instructions, yes (see notes on "SD Card" as well)