Yea, if you don't go nuts, find a nice open spot to practice, and use a little common sense, I think you should be ok.
My philosophy is if you ride offroad, you are going to have mishaps. I can't remember the last time I rode without wiping out at least once. I like to ride as hard and fast as I can, at least for some of the ride, and haven't had any serious injuries (yet) knock on wood. The only time I feel a real danger is being topped out, hitting some whoops and getting pointed in the wrong direction, although I've had a few close calls when I never expected them.
When I got back into offroad about 2 years ago, I think my biggest fear was falling and making mistakes, then I realized that everyone else does and it doesn't necessarily mean you are gonna be a cripple. Just take it easy,especially in the beginning.
If you are fortunate enough to buy a second bike that will get used, do it. I think in my case even if I could afford a second bike, upkeep would bury me. I'd like to ride, not just work on bikes.
Although I like the 125 mx 2 stroke a lot, I find smaller bikes such as the dr, xr, too slow and cumbersome. Yea, to me they are boring to ride whereas my bike is more of a challenge. You already have the bike so go out and try it!!!