A U-Can-DO is a good second plane due to it being able to fly slow and land slow, but you haven't flown a nitro powered plane before. There is a difference between flying a nitro powered plane and an electric model. Unless you have one of those big hacker motors on a Giles, extra, edge, etc... Some thing faster and bigger. I have a sim (realflight G2) and it is a very good sim, but it isn't reality. You may be able to get a Avistar (Sport Trainer), aerosport, etc... as you first nitro plane. Since you do have some experience with RC planes a total flat bottom wing trainer may be skipped, but a leap into an acrobatic nitro plane may be pushing it. If you have help (an instructor), you may be able to do the U-Can-Do as long as the throws and CG are not wild. Keep it mild and you may be ok with an instructor first who can fly those type of planes. I would lean toward the avistar or aerosport sport planes first.