In completing my QB RV8, I needed help to rivet on the top front skin (Or you could use blind rivets), to rivet on the flap root fairings (Or you could use blind rivets) and to mount the wings (they need to go on and off at least once prior to final assembly).
You can do everything else yourself, but you do have to plan ahead and sometimes be creative. Even riveting the bottom wing skins was pretty straightforward.