This was one thing I was worried about prior to playing at FSA, though by the sounds of it I'd managed to get in quite a few 3k point games over the past year or two with Mephiston helping me along - turns out my first ever tourney game was finished with an hour to spare

(that's more to do with Curis utterly flattening me though... an experience in which I picked up some useful tips for next time it's obvious that I'm going to get a bunch of angry chaos dudes planetfalling on my blitz)
Curis wrote:
2. Continual Stat Reference
Looking up the armour for Tactical Marines every time they're fired at sloooows thiiiings down. Especially some players without the quick reference sheet who then flick through several pages of lists to find the right thing.
This is the kind of thing that I found attending FSA really helped with in all honesty, one game every now and then isn't enough to really hammer home stats and make them really
stick and prior to FSA I couldn't have told you the armour save of a tactical marine. Three games in one day and I can pretty much recite half my army's stats without checking now just because I realised I'd checked and double checked the same stats over and over and over, whereas in just one game I might only have to check that particular stat once or twice.