AncestryDNA says I'm 45% Swedish and 8% Norwegian. My maternal grandmother was a full Swede. Her grandparents were all born in Kalmar, Sweden and settled in Montgomery County Iowa during the 1870s. That explains 25% of my DNA but I'm not sure where the other 20% comes from. I still have a few of my maternal grandfather's lines to research, but I'm guessing most of my Swedish DNA comes from my English ancestors. Also not sure where the Norwegian fits it - perhaps some of my Swedish lines actually originated in Norway.
I spent the COVID shutdown learning to navigate the Swedish Church records on Ancestry, and have been able to document several of my grandmother's lines back to the 1700s. It actually wasn't as difficult as I had anticipated, and I enjoyed learning a new genealogical skill. I don't read Swedish, but Family Search has an excellent Swedish translation page for common genealogical terms. If anybody needs help getting started with these records, let me know. I'm far from an expert, but I'm happy to share what I can.