I'm surprised it has not been mentioned yet, but what kind of friend lends you the bigger bike and takes the smaller one. Is he afraid of his wife kicking his butt if someone touches her bike. Like many things, you take someone out with the idea you will have a future riding buddy. Whether skiing, hiking, kayaking or mountain biking, the faster rider keeps a ride out for the Noob. Nothing wrong with starting out and an experienced rider is going to see your level of skill right away. I blame your injuries on your buddy, as well. He should have rode home and got something to come back and get the bike and you. Broken ribs suck and actually heal fast, too. One day they will hurt like all get out, then the next day you won't even recognize they hurt anymore. Start with a smaller bike. A 250 gives you plenty of time to learn the innate skills of riding a dirt bike. Too many "older" guys can't adjust their desire (ego) of getting that big bike, like a Harley, Goldwing, Adventure bike, before they put in their time on a small bike. When the stuff hits the fan, on a big bike, the lessons you learned on a smaller bike (when you were younger) will come back and help. There is always a benefit in starting with a small bike, then sell it as your skill level climbs, or keep it for someone else to ride with you. Just be a better friend, to this new riding buddy, than someone was to you.