The guess was a good one. I puzzled 2 pieces at a time and stacked them. When last pair of row was done I connected all the pairs into a complete row.
I also stacked rows and connected them when I felt like it.
Took a while longer to complete but at the end I got the success message.
Tried to add link to image of my puzzle halfway into completion to better illustrate, but seems chat do not allow links to google drive. Hope you all still understand the steps I took.