Any tips/examples would be appreciated...

i'd start with downloading the software to fill the declaration.....

I already have a paper form so don't need the software. BTW, the link you gave was for Kt Zurich. Kt Schaffhausen has different software...

EDIT: Where do I get my "PID-Nr." from?

yes sorry for the ZH link instead of SH kanton.
Are you asking about the ZPV number for the tax declaration?
If yes, here is an answer.