With the OS.55 you got plenty of horse and once you get use to it , you`ll love the extra power.
If the 3 blade you have is off a Evo trainer system , try switching to the 12x5 or6 Master Airscrew. Not the best puller , but well take the abuse of prop strikes better.
On your wings leading edge put a 1/2 inch stripe , Yellow , brite red or whatever color stands out the most. This well help you with keeping your wings level on landings and with orientation. Also throttle control is a must with overpowering a plane.
If you are determined to teach yourself to fly , be prepared for the set backs and oops that come with it. Oh! and the cost. It well be spendy.
I recommend you spend an hour or 2 with an instructor,this would speed up your skills a bunch. And what you well have learned in that short time, is going to take you a lot longer on your own.
But I`m self taught and well give you what tips I can if this is the way you decide to go. Maybe you should watch this , as it shows how many oops can happen when self taught. [link=http://www.youtube.com/watch?v=_ji4fV03qJA]Insane Flys kind of ![/link]