Yeah youll be fine, i did it last summer, the physical side is pretty easy, the only thing i was bit rubbish at was the surface dives, but the pool i did it at had several depths so i was ok, it generaly is just short distance swims, the longest timed swim was swimming 20 metres, then having to tow a casutaly back 20 metres, think you had around 65 seconds to do that, which is more than enough.