Plus one on the practice and starting off with an "icebreaker" model.

Also, if I am getting the yips, I often think of the quote by Keith Miller, RAAF WW2 pilot and one of Aussie's best all round cricketers who commented in relation to test cricket: "that's not pressure, real pressure is having a Messerschmidt up your arse". So, as others have mentioned, putting things in perspective helps.