As long as you understand the basic concepts that go into a mixer you should be fine. A reasonably basic mixer such as this isn't too hard to get your head around. Sure, you'll have to spend a few days scratching your head but ultimately if you persevere you will be fine.
Look for youtube tutorials and be prepared to have your head stuck in a manual while everyone else enjoys the summer weather. If you're really stuck I could help get you started if you're in London and need a tutor otherwise ask at a local studio if anyone can help you. They may well have a junior member of staff who'd be happy to tutor you.