As long as you're doing it regularly, you commit to it and you have balls (metaphorical, of course), you'll do fine on that schedule. The biggest problem newcomers to whitewater have is that they let their fear take over and stop paddling. Then they're at the mercy of the water, which scares them more, they stop even looking where they're going, and get flipped. The most important thing is to stay relaxed as much as possible (overreacting to events is as bad as not reacting at all), but paddle aggressively and proactively to make sure you're where you need to be well ahead of time - for example, if you start paddling for an eddy as you reach it, you're too late. You need to spot it early and start paddling for it well upstream so that the water flow doesn't sweep you past it.
But then if you've got someone who can run you down class V, frankly you won't need my advice as he's a more serious paddler than I am at the moment :P
Although I maintain that it's just a lack of rivers round 'ere :P