In reply to Matt Hill:
Yes, you should be confident on grade 1 ground. There's a 'steep ground' day on training and assessment where you will be expected to demonstrate you can look after clients on steep, broken ground.
If you are confident moving about on graded terrain, then any steep ground on training and assessment won't be a problem. You will probably get more out of your training if you are in your comfort zone when on steep ground as you'll be able to concentrate on learning new rope skills etc.
Since you mention it, the North Ridge of Tryfan is a common place to see ML training and assessments taking place. We did Seniors Gully and Seniors Ridge on one day of my assessment.
It sounds like you've got the perfect excuse to get away every weekend to log some more classic mountain scrambles!