As stated at slow speeds this plane bites back. I have had the Seagull and Pheonix model decathlons in the .40 size. The plane's looks are very deceaving. It looks like a perfect transition after a trainer but it really isn't. I would say learn to fly a Piper Cub first as it is a bit more forgiving but has many of the same flight characteristics. Of course I do not know your current level of experience.

Additionally the 12x4 prop will work fine but it also has more braking effect than say an 11x6 that I would recomend for your plane and engine. That braking effect will slow that plane down more quickly.