[Unit]
Description=My VNC
[Service]
Type=simple
ExecStartPre=/bin/sh -c '/usr/bin/vncserver -kill %i > /dev/null 2>&1 || :'
ExecStart=/usr/bin/vncserver %i
ExecStop=/usr/bin/vncserver -kill %i
[Install]
WantedBy=default.target
Then
systemctl --user start myvnc@\:1.service
and
systemctl --user enable myvnc@\:1.service
and