I tried using double-sided tape to stick the insert into the book at first. I figured that it would be less messy than PVA when trying to position the folded card, but it started to peel up after just a couple of hours, so I went back to PVA.
I glued the top flap first, positioned it (folded under) on the inside back cover - 5mm from the top and outside edge - then put it under a couple of books to dry (squeeze out and wipe any excess glue first!)
I did the bottom flap once the top was secure. One trick: I was aware of the potential for excess glue to squeeze out underneath at this stage, unseen, and accidentally glue the insert shut, so I slipped a strip of waste card in between, before pressing the glued flap down.
Again, put books on top to dry, or it springs up.
Many people use ribbon to fasten books. I didn't want to drill holes in the cover through, as it acts as a mini drawing board when I am using the book, so I wanted it unsullied. John came up with the Velcro system. I was going to buy Velcro tape, then discovered these nifty little guys:
The beauty of the Velcro is that, when the book is in use, if the unfastened strap gets in the way, you can detach it and stick it back on at 90 degrees. You don't lose it, but it doesn't keep flapping and springing around the edges your paper.
If you found this project useful and want to check out other handy posts, try using the Hot Tips label on the right. I add the label to anything I think might be helpful to other people. It's a bit of a mix, with other ways of home-binding sketchbooks, but also tips for building up an illustration folio, how to do a school visit, create a 'Flat Plan' to plan out a book, or how to use / where to buy particular art materials. All sorts.