I know this is an older post but it's better late than never, right?
With Tip 2....I only save & go on to the next family at nighttime. When the entire family is in bed asleep. That way, I know all my Simmies are home & accounted for.
With Tip 3....I'm with you guys! I "save as" under the name of the world....if I'm playing the Goth family in my Pleasantview, that's what I Save as under Pleasantview. If I'm playing the Grunt family, I save as under Strangetown. I do believe in the very first days of Sims 4, Miss Linda taught me that little trick & it made so much sense...I followed it!
Loving Helpmeet To: Bryan (39 yrs.)
Proud Mama To: BJ - 35, Angel - 31, Kathy - 27, & Shaun - 24
Caring Grandmother To: Rafael - 8, Nadya - 6, & Bruce - 3