Renewing GV - 2nd card - Process

Hello all,
My first residency card has 7 months to go and I need to start the renewal process to get my second card. Has anyone done this recently? How does it all start? Will I get a letter from SEF to let me know that I can look for an appointment?
Any help/clarity on the is much appreciated as I am doing it alone.

Thanks
Andrew

I did it myself. And was wondering if someone had renewed themselves. And had experience in the process and timelines.
I find it best not to imagine how I think a government process should be run… although you are probably close to right.

See SEF info here: https://imigrante.sef.pt/en/renovar-residencia/art90-a/

Thankyou, that is very useful.