I'm quite good, I've got the nack of it somehow....
I'm just too short, so play for treble 19's rather than treble 20's
If I get to a finish of doubles tops, I'm stuffed
Play for 32/16 as your exit/checkout (what do you call it?) as double 16 and double 8 are among the easiest checkouts to make and if you hit 16 you only need a small adjustment for double 8.