I HIGHLY encourage that you get at least one lesson before attempting the test. Regardless of how much experience you have, an instructor will pick up any bad habits you have and will tell you exactly how to pass the test. And if you get one locally, they'll familiarise you with the routes the assessors take. It might cost a bit more, but you'll have a considerably better chance of getting your P's. And because you're doing it in an R33 (that exceeds that power to weight ratio), you'll be scrutinised considerably by the assessor, just because it's an R33 and you're going for your P's in it.
It really depends on the assessor, which is why an instructor is good, because they usually know who the good assessors are.