I panicked like mad the day before my IRT and ended up planning each of the 4 routes (8 if you include the off airways) in the most minute detail. Probably a good thing. On the day however, I got the simplest route, full airways clearance before I left the ground at Cranfield, radar vectors at Cambridge, cleared straight in to the hold at 3000' back at Cranfield with about 15 a/c stacked up above me. Still managed to make some major srcew ups... but got through in the end with a 1st time pass. Without a doubt my best flying experience to date.