Hi "hocpoc!" You mentioned you've flown slow flyers, had some "sim" time, so I assume you can drive an r/c model around. So, let's get your .25 off the ground. First off please heed Montague's advice and install larger wheels, and go to a 9x4 or 9x5 prop. I recommend a Master Airscrew prop, they seem to have more "bite." But dull the prop edges as they are razor sharp, and hard on the fingers! The larger wheels, especially the nose wheel will handle the drag from the grass better, and afford better steering, if you have it on this plane. Keep the grass mowed short. These things should aid getting you airborne, but you'll find this trainer a lot faster than what you're used to, so be prepared once airborne, to slow it down to where it maintains altiltude at a slow speed. Stay at around 50 to 75% power. This will allow you to mentally stay "in front" of the plane. Stay high and up wind of the strip, just in case. You can always glide back. 10 acres, even with a bunch of clear terrain around it can dwindle with a fast airplane, and getting it back to the strip should always be foremost in your mind. It's your airplane and you have to fly it, so go for it. Good luck and let us know how you make out.