Install GuixSD using an existing Linux system

I want to install Guix System Distribution (or GuixSD, or just Guix) alongside some other distros. The problem is, Guix doesn't recognise Realtek drivers, which are nonfree, so I can't use WiFi. I can install Guix with Ethernet, but it is very unstable, so I want to install it with my existing Debian (buster) installation so I can then add the Nonguix channel and install the drivers. Problem is, I don't really know how. I'm pretty sure it includes installing Guix onto Debian, installing some packages, and strapping GuixSD onto the root (atleast, that's how NixOS does it, which Guix is inspired by) or it includes chrooting into the ISO. I would appreciate any help possible. ## System Info

# neofetch # some info was filtered

root@deblugo 
--------------- 
OS: Debian GNU/Linux 10 (buster) x86_64 
Host: HP Notebook 
Kernel: 4.19.0-16-amd64 
Packages: 1624 (dpkg) 
Shell: bash 5.0.3  
CPU: Intel Celeron N3060 (2) @ 2.480GHz 
GPU: Intel Atom/Celeron/Pentium Processor x5-E8000/J3xxx/N3xxx 
Memory: 1931MiB / 3803MiB 

# lsb_release -a
No LSB modules are available.
Distributor ID:	Debian
Description:	Debian GNU/Linux 10 (buster)
Release:	10
Codename:	buster

# uname -a
Linux deblugo 4.19.0-16-amd64 #1 SMP Debian 4.19.181-1 (2021-03-19) x86_64 GNU/Linux

# cat /etc/os-release
PRETTY_NAME="Debian GNU/Linux 10 (buster)"
NAME="Debian GNU/Linux"
VERSION_ID="10"
VERSION="10 (buster)"
VERSION_CODENAME=buster
ID=debian
HOME_URL="https://www.debian.org/ "
SUPPORT_URL="https://www.debian.org/support "
BUG_REPORT_URL="https://bugs.debian.org/ "