Gives me confidence that nice one. I want to build up two cards so it may be that this season I get a lot as singles, with a view to getting pairs next season.
Definitely doable to build up cards from scratch. Me and my mate were on zero ahead of 2014-15 and have all 19 now (did ten that season, then up to 16 the following and then full set last season). We've always sat together too, never had to rely on separate singles!
You definitely have to put in a fair bit of effort though, and you'll be totally sick of the sight of the ticket page and stadium map fairly quickly you'll see it that often. (Especially if you're chasing seats in late availability)