If you need to install Pipewire:
Add the repository
sudo add-apt-repository ppa:pipewire-debian/pipewire-upstream
Update your sources and install:
sudo apt update && sudo apt install pipewire pipewire-audio-client-libraries
It would be wise to avoid headaches later - have everything you may need:
sudo apt install gstreamer1.0-pipewire libpipewire-0.3-{0,dev,modules} libspa-0.2-{bluetooth,dev,jack,modules} pipewire{,-{audio-client-libraries,pulse,media-session,bin,locales,tests}}
Reload the daemon:
systemctl --user daemon-reload
Now you must disable that rapscallion PulseAudio:
systemctl --user --now disable pulseaudio.service pulseaudio.socket
Fire up pipewire:
systemctl --user --now enable pipewire pipewire-pulse