Does the amount of fuel a plane carriers affect its handling? Does placement of fuel tanks have an impact?

TL:DW

Yes, it does. Depending on aircraft & fuel tank placement (example studied - P-51D - notoriously unstable when its rear fuel tank was full IRL), it can make an otherwise docile and joyful plane to fly an exercise in frustration as its nose wobbles and refuses to stay put.

I decided to repost this video I made as response to a forum thread to hopefully aid people asking the same question.