The most important thing I found in tri’s was knowing where your kit was during transition. Make sure its near a feature for easy location !
On that sort of length triathlon, don’t waste time on the cycling shoes, do it in trainers – sock are optional, I do put them on…
Counting should be fine ! After all what’s to stop anyone shouting “X laps to go come on !”
I don’t have a tri suit, I do the whole thing in my swimming stuff, adding a T-shirt for the stuff outside a pool.
Brick training is important – ride hard are go straight for a run… Feels very odd at first!
But then again, I have only done 3 so far, so use a pinch of salt for the advice! Alternatively I have finished in the top 5% in all three… :-)